Support deployment of RHCS4 via director
https://blueprints.launchpad.net/tripleo/+spec/ceph-mimic-nautilus
*** Bug 1555006 has been marked as a duplicate of this bug. ***
Re-setting Target Milestone z1 to --- to begin the 15z1 Maintenance Release.
Verified
Closing EOL, OSP 15 has been retired as of Sept 19, 2020