heat common : policy.py change LOG to logger
heat common : policy.py change LOG to logger

The convention in most other files is to use "logger" for the
log handle, so this file using "LOG" looks a bit odd/inconsistent

ref bug 1150091

Change-Id: I159ad59dfaa3a1db36aad11cb6ce9625f1105c51

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