Commit 43434c4325 ("Revert "Revert "SUSE: Switch to OBS Cloud Master
repository""") added the Master OBS repository for openSUSE but it
did not use 'opensuse_mirror_obs' variable so OpenStack Infra mirrors
are not being used anymore making the deployment less reliable.
Fixes: 43434c4325 ("Revert "Revert "SUSE: Switch to OBS Cloud Master repository""")
Change-Id: I664d9d8a1e6492b92489975d42c4603c699f7824