Fix: InvalidParameterValue Exception not raised correctly
Fix: InvalidParameterValue Exception not raised correctly

InvalidParameterValue Exception was not properly raised which
resulted in Error 500.

Change-Id: I760f4596b8a06ad6eb7eaf7bdf332184e856c22a
Closes-Bug: #1638539

openstack/magnum,openstack/magnum,ArchiFleKs/magnum,ArchiFleKs/magnum