Remove absolute path in KillFilter for metadata-proxy

This commit fix the problem of killing neutron-ns-metadata-proxy
when running in Virtual Environment.

Change-Id: I987dd87e19c218846a48e58b61679b4153d97f66
Closes-bug: #1363773
Add the unit tests for ml2.rpc module

Increase coverage of unit tests until 100% for ml2.rpc module.

Closes-bug: #1269136

Change-Id: I87c40e6462018df6a4dc70c6a1285de55f827877
Merge "Remove absolute path in KillFilter for metadata-proxy"
Merge "Add the unit tests for ml2.rpc module"