Validate bandwidth configuration for other VIF types
Validate bandwidth configuration for other VIF types

Multiple VIF types support bandwidth configuration but this was not
being tested. Do this, DRY'ing the tests in the process.

Change-Id: Icc903834eee59993d89bd20eec39f67134353293
Related-Bug: #1814882

rahulunair/nova,mahak/nova,klmitch/nova,rahulunair/nova,openstack/nova,klmitch/nova,mahak/nova,rahulunair/nova,openstack/nova,klmitch/nova,openstack/nova,klmitch/nova,mahak/nova