suite: honor suite_verify_ceph_hash on --dry-run
suite: honor suite_verify_ceph_hash on --dry-run

When running dry-run, an attempt is made to figure out if the hash of
the job is already present in the gitbuilder. This must not be done
if suite_verify_ceph_hash is false.

Signed-off-by: Loic Dachary <b6eae37fc74638590e3f9030895d42446505d41b@dachary.org>

dmick/teuthology,dmick/teuthology,SUSE/teuthology,SUSE/teuthology,SUSE/teuthology,ktdreyer/teuthology,ceph/teuthology,ceph/teuthology,dmick/teuthology,ktdreyer/teuthology