Added relax option to oftest

This option relaxes restrictions around receiving unexpected packets.
It's main use case is in evironments where in-band control is enabled and
as a consequence packets are forwarded to dataplane ports.
diff --git a/tests/basic.py b/tests/basic.py
index a173a30..394ab0a 100644
--- a/tests/basic.py
+++ b/tests/basic.py
@@ -209,7 +209,18 @@
             pkt = simple_tcp_packet()
             self.dataplane.send(of_port, str(pkt))
             #@todo Check for unexpected messages?
-            (response, raw) = self.controller.poll(ofp.OFPT_PACKET_IN, 2)
+            count = 0
+            while True:
+                (response, raw) = self.controller.poll(ofp.OFPT_PACKET_IN, 2)
+                if not response:  # Timeout
+                    break
+                if str(pkt) == response.data:  # Got match
+                    break
+                if not basic_config["relax"]:  # Only one attempt to match
+                    break
+                count += 1
+                if count > 10:   # Too many tries
+                    break
 
             self.assertTrue(response is not None, 
                             'Packet in message not received on port ' + 
@@ -255,7 +266,14 @@
             rv = self.controller.message_send(msg)
             self.assertTrue(rv == 0, "Error sending out message")
 
-            (of_port, pkt, pkt_time) = self.dataplane.poll(timeout=1)
+            exp_pkt_arg = None
+            exp_port = None
+            if basic_config["relax"]:
+                exp_pkt_arg = outpkt
+                exp_port = dp_port
+            (of_port, pkt, pkt_time) = self.dataplane.poll(timeout=1, 
+                                                           port_number=exp_port,
+                                                           exp_pkt=exp_pkt_arg)
 
             self.assertTrue(pkt is not None, 'Packet not received')
             basic_logger.info("PacketOut: got pkt from " + str(of_port))
diff --git a/tests/oft b/tests/oft
index f7b72f0..a56a9ea 100755
--- a/tests/oft
+++ b/tests/oft
@@ -159,6 +159,7 @@
     "port_count"         : 4,
     "base_of_port"       : 1,
     "base_if_index"      : 1,
+    "relax"              : False,
     "test_spec"          : "all",
     "test_dir"           : ".",
     "log_file"           : "oft.log",
@@ -240,6 +241,8 @@
                       help="List all tests and exit")
     parser.add_option("--verbose", action="store_true",
                       help="Short cut for --debug=verbose")
+    parser.add_option("--relax", action="store_true",
+                      help="Relax packet match checks allowing other packets")
     parser.add_option("--param", type="int",
                       help="Parameter sent to test (for debugging)")
     parser.add_option("-t", "--test-params",
@@ -370,6 +373,7 @@
 (config, args) = config_setup(config_default)
 
 test_list_generate(config)
+oft_config = config
 
 # Check if test list is requested; display and exit if so
 if config["list"]:
diff --git a/tests/pktact.py b/tests/pktact.py
index c2d4a68..a551d58 100644
--- a/tests/pktact.py
+++ b/tests/pktact.py
@@ -141,7 +141,16 @@
             pa_logger.info("Sending packet to dp port " + 
                            str(ingress_port))
             self.dataplane.send(ingress_port, str(pkt))
-            (rcv_port, rcv_pkt, pkt_time) = self.dataplane.poll(timeout=1)
+
+            exp_pkt_arg = None
+            exp_port = None
+            if pa_config["relax"]:
+                exp_pkt_arg = pkt
+                exp_port = egress_port
+
+            (rcv_port, rcv_pkt, pkt_time) = self.dataplane.poll(timeout=1, 
+                                                                port_number=exp_port,
+                                                                exp_pkt=exp_pkt_arg)
             self.assertTrue(rcv_pkt is not None, "Did not receive packet")
             pa_logger.debug("Packet len " + str(len(rcv_pkt)) + " in on " + 
                          str(rcv_port))
@@ -219,7 +228,7 @@
             no_ports = set(of_ports).difference(yes_ports)
 
             receive_pkt_check(self.dataplane, pkt, yes_ports, no_ports,
-                              self, pa_logger)
+                              self, pa_logger, pa_config)
 
 class DirectMCNonIngress(basic.SimpleDataPlane):
     """
@@ -273,7 +282,7 @@
             self.dataplane.send(ingress_port, str(pkt))
             yes_ports = set(of_ports).difference([ingress_port])
             receive_pkt_check(self.dataplane, pkt, yes_ports, [ingress_port],
-                              self, pa_logger)
+                              self, pa_logger, pa_config)
 
 
 class DirectMC(basic.SimpleDataPlane):
@@ -327,7 +336,7 @@
             pa_logger.info("Sending packet to dp port " + str(ingress_port))
             self.dataplane.send(ingress_port, str(pkt))
             receive_pkt_check(self.dataplane, pkt, of_ports, [], self,
-                              pa_logger)
+                              pa_logger, pa_config)
 
 class Flood(basic.SimpleDataPlane):
     """
@@ -375,7 +384,7 @@
             self.dataplane.send(ingress_port, str(pkt))
             yes_ports = set(of_ports).difference([ingress_port])
             receive_pkt_check(self.dataplane, pkt, yes_ports, [ingress_port],
-                              self, pa_logger)
+                              self, pa_logger, pa_config)
 
 class FloodPlusIngress(basic.SimpleDataPlane):
     """
@@ -426,7 +435,7 @@
             pa_logger.info("Sending packet to dp port " + str(ingress_port))
             self.dataplane.send(ingress_port, str(pkt))
             receive_pkt_check(self.dataplane, pkt, of_ports, [], self,
-                              pa_logger)
+                              pa_logger, pa_config)
 
 class All(basic.SimpleDataPlane):
     """
@@ -474,7 +483,7 @@
             self.dataplane.send(ingress_port, str(pkt))
             yes_ports = set(of_ports).difference([ingress_port])
             receive_pkt_check(self.dataplane, pkt, yes_ports, [ingress_port],
-                              self, pa_logger)
+                              self, pa_logger, pa_config)
 
 class AllPlusIngress(basic.SimpleDataPlane):
     """
@@ -525,7 +534,7 @@
             pa_logger.info("Sending packet to dp port " + str(ingress_port))
             self.dataplane.send(ingress_port, str(pkt))
             receive_pkt_check(self.dataplane, pkt, of_ports, [], self,
-                              pa_logger)
+                              pa_logger, pa_config)
             
 class FloodMinusPort(basic.SimpleDataPlane):
     """
@@ -584,7 +593,7 @@
             no_ports = set([ingress_port, no_flood_port])
             yes_ports = set(of_ports).difference(no_ports)
             receive_pkt_check(self.dataplane, pkt, yes_ports, no_ports, self,
-                              pa_logger)
+                              pa_logger, pa_config)
 
             # Turn no flood off again
             rv = port_config_set(self.controller, no_flood_port,
diff --git a/tests/testutils.py b/tests/testutils.py
index 084f74d..450b330 100644
--- a/tests/testutils.py
+++ b/tests/testutils.py
@@ -214,7 +214,8 @@
     rv = controller.message_send(mod)
     return rv
 
-def receive_pkt_check(dataplane, pkt, yes_ports, no_ports, assert_if, logger):
+def receive_pkt_check(dataplane, pkt, yes_ports, no_ports, assert_if, logger,
+                      config):
     """
     Check for proper receive packets across all ports
     @param dataplane The dataplane object
@@ -223,10 +224,14 @@
     @param no_ports Set or list of ports that should not receive packet
     @param assert_if Object that implements assertXXX
     """
+    exp_pkt_arg = None
+    if config and config["relax"]:
+        exp_pkt_arg = pkt
+
     for ofport in yes_ports:
         logger.debug("Checking for pkt on port " + str(ofport))
         (rcv_port, rcv_pkt, pkt_time) = dataplane.poll(
-            port_number=ofport, timeout=1)
+            port_number=ofport, timeout=1, exp_pkt=exp_pkt_arg)
         assert_if.assertTrue(rcv_pkt is not None, 
                              "Did not receive pkt on " + str(ofport))
         assert_if.assertEqual(str(pkt), str(rcv_pkt),
@@ -236,7 +241,7 @@
     for ofport in no_ports:
         logger.debug("Negative check for pkt on port " + str(ofport))
         (rcv_port, rcv_pkt, pkt_time) = dataplane.poll(
-            port_number=ofport, timeout=1)
+            port_number=ofport, timeout=1, exp_pkt=exp_pkt_arg)
         assert_if.assertTrue(rcv_pkt is None, 
                              "Unexpected pkt on port " + str(ofport))
 
@@ -247,8 +252,14 @@
 
     parent must implement dataplane, assertTrue and assertEqual
     """
+    exp_pkt_arg = None
+    if parent.config["relax"]:
+        exp_pkt_arg = exp_pkt
+
     (rcv_port, rcv_pkt, pkt_time) = parent.dataplane.poll(port_number=egr_port,
-                                                          timeout=1)
+                                                          timeout=1, 
+                                                          exp_pkt=exp_pkt_arg)
+
     if rcv_pkt is None:
         parent.logger.error("ERROR: No packet received from " + str(egr_port))
 
@@ -592,7 +603,6 @@
 
     new_actions = []
 
-
     base_pkt_params = {}
     base_pkt_params['pktlen'] = 100
     base_pkt_params['dl_dst'] = '00:DE:F0:12:34:56'