Improve unit tests for python-quantumclient
Improve unit tests for python-quantumclient

Add tests for quantumclient.quantum.v2.quota

Partially Fixes: bug #1137783

Change-Id: I62fef9334ac864eda2f980d8ad173c536b2f3b1b

metacloud/python-neutronclient,metacloud/python-neutronclient