Refaftor get_nailgun_node_by_devops_node method

It should use mac address of a physical interface for matching
devops node to nailgun node.

Change-Id: Ia16bd449a030ca9901ef4b45ad9519305ba2ac5e
Remove version for rabbitmq-server

Related-Bug: #1279594

Change-Id: I8809e0b332365b77d4b161e4b0fe0dcfe2afb6d0
Merge "Remove version for rabbitmq-server"
Fix expected results for huge_enviroment

Change-Id: I278c6c5efd5848f47e7b6ed246aa27a7c49462e8
Merge "Refaftor get_nailgun_node_by_devops_node method"