Skip ServerActionsTestJSON.test_rebuild_server for cells v1 job
Skip ServerActionsTestJSON.test_rebuild_server for cells v1 job

This is another occurrence of a rebuild test randomly timing out
waiting for status changes in the cells v1 job, so blacklist it.
Cells v1 is deprecated and should be gone soon anyway, so we don't
need to waste time hitting stuff like this.

Change-Id: Icb1d33c6e602467e21efe4838cb6edbadab14834
Related-Bug: #1709985

klmitch/nova,gooddata/openstack-nova,openstack/nova,rahulunair/nova,mahak/nova,mikalstill/nova,klmitch/nova,klmitch/nova,phenoxim/nova,klmitch/nova,gooddata/openstack-nova,rahulunair/nova,mikalstill/nova,gooddata/openstack-nova,mahak/nova,phenoxim/nova,mahak/nova,openstack/nova,gooddata/openstack-nova,rahulunair/nova,openstack/nova,mikalstill/nova