Add in support for recording the "best" parent found as repo metadata.
Add in support for recording the "best" parent found as repo metadata.

This also makes cut_release record the same metadata.

mmnelemane/crowbar,tserong/crowbar,rsalevsky/crowbar,dirkmueller/crowbar,dirkmueller/crowbar,crowbar/crowbar,rhafer/crowbar,SUSE-Cloud/crowbar,rsalevsky/crowbar,crowbar/crowbar,aplanas/crowbar,toabctl/crowbar,rhafer/crowbar,toabctl/crowbar,mmnelemane/crowbar,vwallfahrer/crowbar,aspiers/crowbar,vwallfahrer/crowbar,MaximilianMeister/crowbar,SUSE-Cloud/crowbar,nkrinner/crowbar,nkrinner/crowbar,tserong/crowbar,rhafer/crowbar,MaximilianMeister/crowbar,aspiers/crowbar,aplanas/crowbar