Make Volume tests independent
Make Volume tests independent

Previously, the VolumeAttachment tests relied on stuff left in the database
by the Volume tests.

Change-Id: I8ff63cb6dac0968e63a83fb5c2f78e2a9024dd7c
Signed-off-by: Zane Bitter <1899fff8e7db19a598ee9d835aa1a232f82ea264@redhat.com>

cryptickp/heat,openstack/heat,dims/heat,cwolferh/heat-scratch,dragorosson/heat,rdo-management/heat,dragorosson/heat,rh-s/heat,gonzolino/heat,redhat-openstack/heat,gonzolino/heat,openstack/heat,pratikmallya/heat,srznew/heat,takeshineshiro/heat,rh-s/heat,varunarya10/heat,ntt-sic/heat,noironetworks/heat,JioCloud/heat,cwolferh/heat-scratch,NeCTAR-RC/heat,rickerc/heat_audit,rickerc/heat_audit,rdo-management/heat,NeCTAR-RC/heat,ntt-sic/heat,jasondunsmore/heat,Triv90/Heat,maestro-hybrid-cloud/heat,citrix-openstack-build/heat,dims/heat,pshchelo/heat,pshchelo/heat,redhat-openstack/heat,srznew/heat,Triv90/Heat,jasondunsmore/heat,steveb/heat,steveb/heat,Triv90/Heat,varunarya10/heat,noironetworks/heat,citrix-openstack-build/heat,maestro-hybrid-cloud/heat,JioCloud/heat,miguelgrinberg/heat,miguelgrinberg/heat,takeshineshiro/heat,cryptickp/heat,pratikmallya/heat