LU-13645 ldlm: group locks for DOM IBIT lock

LU-13645 ldlm: group locks for DOM IBIT lock

Group lock is supposed to be taken on such operations as layout swap
used for e.g. HSM, and is to be taken for DOM locks as well.

HPE-bug-id: LUS-8987
Signed-off-by: Vitaly Fertman <c17818@cray.com>
Change-Id: I97888e1aee853d7fe04548681b2ed6805cb494ae
Reviewed-on: https://review.whamcloud.com/39406
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>