Fix to update docker-py to 1.9.0 version to avoid exec command hangs through docker-py client.
Also remove the links for ovs interfaces from linux during cleanup.
This would enable the containers to be configured again with the peer interfaces on setup

Change-Id: I923c7ebec2ff0724eb59af11a4c21a260a56772c
diff --git a/src/test/setup/cord-test.py b/src/test/setup/cord-test.py
index 0143715..4efe7e4 100755
--- a/src/test/setup/cord-test.py
+++ b/src/test/setup/cord-test.py
@@ -95,7 +95,7 @@
             self.start(rm = False, volumes = volumes, environment = env,
                        host_config = host_config, tty = True)
 
-    def execute_switch(self, cmd, shell = True):
+    def execute_switch(self, cmd, shell = False):
         if self.olt:
             return os.system(cmd)
         return self.execute(cmd, shell = shell)
@@ -197,7 +197,8 @@
                     cmds = ('brctl delif {} {}'.format(intf_host, local_if),
                             'ip link del {}'.format(local_if))
                 else:
-                    cmds = ('ovs-vsctl del-port {} {}'.format(intf_host, local_if),)
+                    cmds = ('ovs-vsctl del-port {} {}'.format(intf_host, local_if),
+                            'ip link del {}'.format(local_if))
 
             for cmd in cmds:
                 res += os.system(cmd)