engine : remove unnecessary default check_*_complete functions
engine : remove unnecessary default check_*_complete functions

The default behavior in _do_action is to declare COMPLETE if the
check_$action_complete is not implemented, so these default
functions returning True are not needed.

Change-Id: I2fd1b7da1d39d23abc81e1b9171b053e547b2ec6

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