Sync oslo rpc

Sync openstack/common/rpc to fbbb12ea5ff51df744d3de1f312bbcf75aea1670
so we get the fixes required for bug 1257293

Change-Id: Ib2f13d1af91e005c5ee74d462c3fb307f699e7ca
Closes-Bug: #1257293
Document Port properties

Add description to the various properties of the OS::Neutron::Port
resource.

Closes-Bug: #1224176
Change-Id: I910730996409073a1ceaa483d3ef2ce25aac3dc6
Merge "Document Port properties"
Merge "Sync oslo rpc"