Use default timeouts

Extended a couple of timeouts and changed several tests to
use the default timeout from the configuration parameters
diff --git a/tests/pktact.py b/tests/pktact.py
index aca6766..660aa07 100644
--- a/tests/pktact.py
+++ b/tests/pktact.py
@@ -458,7 +458,7 @@
                 exp_port = None
 
                 while True:
-                    (response, raw) = self.controller.poll(ofp.OFPT_PACKET_IN, 2)
+                    (response, raw) = self.controller.poll(ofp.OFPT_PACKET_IN)
                     if not response:  # Timeout
                         break
                     if dataplane.match_exp_pkt(pkt, response.data): # Got match