LU-8837 lmv: don't include struct lu_qos_rr in client

LU-8837 lmv: don't include struct lu_qos_rr in client

The 'lqrr' field in 'struct lu_qos' is not used on the client (lmv).
So make it server-only for use in lod.

- move 'struct lu_qos_rr' into lu_target.h
- protect lq_rr with HAVE_SERVER_SUPPORT
- make lu_qos_rr_init() a static-inline in lu_target,
  and call it explicitly from lod instead of from lu_tgt_descs_init()
- protect setting of LQ_DIRTY to in lu_tgt_descs.c with
  HAVE_SERVER_SUPPORT

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I019cac560d68688042a02a53bd96b605909acdcd
Reviewed-on: https://review.whamcloud.com/41950
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>