make rabbit port optional in the config file

Change-Id: Ic723caf7a22cb4b18941ff0d1c70bb6a51e0e0d6
remove unneeded node attributes in tests

Change-Id: Ifd75506f8989072f96edef4b43e7587ee413d177
Merge "remove unneeded node attributes in tests"
Merge "make rabbit port optional in the config file"