osd: replace mclock subop opclass w/ rep_op opclass; combine duplicated code

osd: replace mclock subop opclass w/ rep_op opclass; combine duplicated code

The OSD subops were replaced with replication ops (i.e., MSG_OSD_REPOP
and MSG_OSD_REPOPREPLY) in jewel. mClock incorrectly used them as an
op class rather than the newer replication ops. This fixes that and
places eight ops into the repop class -- MSG_OSD_REPOP,
MSG_OSD_REPOPREPLY, MSG_OSD_PG_UPDATE_LOG_MISSING,
MSG_OSD_PG_UPDATE_LOG_MISSING_REPLY, MSG_OSD_EC_WRITE,
MSG_OSD_EC_WRITE_REPLY, MSG_OSD_EC_READ, and MSG_OSD_EC_READ_REPLY.

This alo removes dupliated code related to op classes in
mClockOpClassQueue and mClockClientQueue and combines into
mClockOpClassSupport.

The three configuration options
osd_op_queue_mclock_osd_subop_{res,wgt,lim} have also been replaced
with osd_op_queue_mclock_osd_rep_op_{res,wgt,lim}.

This also removes OpQueueItem::OpQueueable::op_type_t::osd_subop since
it's not a category core ceph recognizes and is instead it's part of
an mclock view of ops.

Signed-off-by: J. Eric Ivancich <ivancich@redhat.com>