Fix the group type filter
Fix the group type filter

The filter for group types in DB API is wrong. It is filtering
on VolumeTypes instead of GroupTypes. It should be fixed so that
non-admin can only see public group types.

Change-Id: Idadff9d5519a3c2fef63307f4f9967980f1b0328
Closes-Bug: #1617683

cloudbase/cinder,mahak/cinder,openstack/cinder,Nexenta/cinder,phenoxim/cinder,Datera/cinder,j-griffith/cinder,cloudbase/cinder,eharney/cinder,Hybrid-Cloud/cinder,j-griffith/cinder,Datera/cinder,mahak/cinder,NetApp/cinder,openstack/cinder,ge0rgi/cinder,eharney/cinder,phenoxim/cinder,Nexenta/cinder,Hybrid-Cloud/cinder,NetApp/cinder