LU-16046 ldlm: group lock fix

LU-16046 ldlm: group lock fix

The original LU-9964 fix had a problem because with many pages in
memory grouplock unlock takes 10+ seconds just to discard them.

The current patch makes grouplock unlock asynchronous. It introduces
a logic similar to the original one, but on mdc/osc layer.

add a new test similar to sanity_244b but for DOM layout files.

HPE-bug-id: LUS-10644, LUS-10906
Signed-off-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Change-Id: Ib6d6a3a41baff5b0161468abfd959f52e2a1b497
Reviewed-on: https://es-gerrit.dev.cray.com/159856
Reviewed-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-by: Alexander Boyko <c17825@cray.com>
Tested-by: Elena Gryaznova <c17455@cray.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48038
Reviewed-by: Alexander <alexander.boyko@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>