Bug 1354003: When quota is exceeded, API server sends PermissionDenied error. Catch this error and send appropriate error message to neutron

Change-Id: I06d4fafa33e131fe1d6b9f8325fc63e289de1676
Merge "Bug 1354003: When quota is exceeded, API server sends PermissionDenied error. Catch this error and send appropriate error message to neutron" into R1.10