Allow a resource delete to be re-attempted.
Allow a resource delete to be re-attempted.

If a resource is in a DELETE IN_PROGRESS state, and the resource
is deleted again, another attempt will be made to delete the resource.

Fixes bug: #1193975

Change-Id: I615612b4e5f21f2a2cb168f47c33a8f9db7e9e81

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