LU-18498 hsm: don't lock llog at cdt

LU-18498 hsm: don't lock llog at cdt

llog does not need outside locking. Only HSM data
should be protected inside callbacks. Howevere most of
it only read data. cdt_last_cookie is converted to
atomic64_t. Also fix adds synchronization between
hsm_cancel_all_actions() and mdt_coordinator(), cancels
wait ongoing work.
To be safe between llog processing vs record modification,
dt_write_lock() is added to a modification llog_osd part.

Test-Parameters: testlist=sanity-hsm,sanity-pcc
HPE-bug-id: LUS-12557
Signed-off-by: Alexander Boyko <alexander.boyko@hpe.com>
Change-Id: I67eb98dcd57d4db6916c80c17b566577e7efddf0
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/57197
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Sergey Cheremencev <scherementsev@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>