MOSDOp: include reassert_version in print

Signed-off-by: Sage Weil <sage@inktank.com>
ceph_test_rados: wait for commit, not ack

First, this is what we wanted in the first place

Second, if we wait for ACK, we may look at a user_version value that is
not stable.

Fixes: #7705
Signed-off-by: Sage Weil <sage@inktank.com>