Updates OpenStack Style Commandments link
Updates OpenStack Style Commandments link

The current link in the HACKING file is broken. This references the
correct location for contributors to view.

Change-Id: I9edc768bca825534771d79082e7824befa51e1b8

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