Neutron metering does not check overlap ip range

Neutron does not return "MeteringLabelRuleOverlaps" error, when the
remote ip ranges in the meter label rules are overlapped.

Change-Id: I4c2536a7d38b5f6d311db365c8c108d5367705a7
Closes-bug: #1361264
Check for concurrent port binding deletion before binding the port

When agent tries to update port binding (DVR or regular), the port
might have already been deleted via API call.
This is not an error condition but should be handled to avoid traces
in the logs.

Change-Id: Ie9436172151f0ecd5b3e4667328910b09f8ef141
Closes-Bug: #1370570
Merge "Check for concurrent port binding deletion before binding the port"
Merge "Neutron metering does not check overlap ip range"
Merge branch 'master' of https://github.com/openstack/quantum