Fix super() calls for objects.Cluster
Fix super() calls for objects.Cluster

Reviewed-by: imsnah


leshchevds/ganeti,apyrgio/ganeti,dimara/ganeti,mbakke/ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/snf-ganeti,yiannist/ganeti,grnet/snf-ganeti,apyrgio/snf-ganeti,yiannist/ganeti,ganeti/ganeti,onponomarev/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,apyrgio/ganeti,dimara/ganeti,andir/ganeti,leshchevds/ganeti,grnet/snf-ganeti,mbakke/ganeti,andir/ganeti,yiannist/ganeti,andir/ganeti,onponomarev/ganeti,bitemyapp/ganeti,leshchevds/ganeti,bitemyapp/ganeti,ganeti/ganeti