Improvements to DB setup
Improvements to DB setup

Don't fail if the database or user already exists.

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

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