ceph.conf: journal_zero_on_create = true
ceph.conf: journal_zero_on_create = true

Make sure we test this code path.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@redhat.com>

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