Improve test coverage for quantum wsgi module
Improve test coverage for quantum wsgi module

OpenStack quantum.wsgi package includes a lot of classes not covered
with unit tests. This change adds such unit tests.

Fixes: bug #1136027
Change-Id: I16dd35389bf82f2818b74d1fb4cf7f7a6bebce28

gkotton/vmware-nsx,gkotton/vmware-nsx