Don't skip watchrule test on exception
Don't skip watchrule test on exception

There are no circumstances in which failing to import the
heat.engine.watchrule module would not be an issue.

Change-Id: I6d03ed8f761a24aa69409010390289e387523813
Signed-off-by: Zane Bitter <1899fff8e7db19a598ee9d835aa1a232f82ea264@redhat.com>

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