Need to use rabbit_port 5673 only in HA setup where rabbit-server is provisioned in HA nodes
	If ampq_host is set in the env.openstack dictionary for testbed.py(external rabbit nodes) should use default rabbit port 5672

Change-Id: I09b7f47571814754e87c5b4a24441fc7da33e285
Merge "Need to use rabbit_port 5673 only in HA setup where rabbit-server is provisioned in HA nodes 	If ampq_host is set in the env.openstack dictionary for testbed.py(external rabbit nodes) should use default rabbit port 5672"