common: upgrade/install ceph-test RPM first

common: upgrade/install ceph-test RPM first

Prior to this change, if a user had ceph-test-12.2.1 installed, and
upgraded to ceph v12.2.3 or newer, the RPM upgrade process would
fail.

The problem is that the ceph-test RPM did not depend on an exact version
of ceph-common until v12.2.3.

In Ceph v12.2.3, ceph-{osdomap,kvstore,monstore}-tool binaries moved
from ceph-test into ceph-base. When ceph-test is not yet up-to-date, Yum
encounters package conflicts between the older ceph-test and newer
ceph-base.

When all users have upgraded beyond Ceph < 12.2.3, this is no longer
relevant.