LU-16077 tbf: pb_uid/pb_gid ptlrpc_body fields for TBF rules

LU-16077 tbf: pb_uid/pb_gid ptlrpc_body fields for TBF rules

The file UID/GID are packed inside bulk IO because the requests are
sent asynchronously (cannot use the current thread UID/GID).

This is an issue for TBF rules if the file/inode UID/GID doesn't
match the process ones (e.g: reading common libraries): we can't limit
the user RPCs doing the IOs in that case.

This patch pack UID/GID for TBF rules inside ptlrpc_body (
pb_padding64_2 -> (pb_uid, pb_gid)) to be independent of quota
interactions: it stores the client process UID/GID instead of the
values of the file attrs.
Moreover, it enables to track requests naturally without UID/GID like
ldlm_flock_enqueue.

This patch saves the process UID/GID inside the ll_inode_info struct.
Then it restores these values when sending a bulk IO from a ptlrpc
thread (like for jobids).

Add sanityn test_77jb to verify.

Fixes: e0cdde1 ("LU-9658 ptlrpc: Add QoS for uid and gid in NRS-TBF")
Test-Parameters: testlist=sanityn env=ONLY=77,ONLY_REPEAT=20
Test-Parameters: serverversion=2.12.9 testlist=sanityn env=ONLY=77
Test-Parameters: clientversion=2.12.9 testlist=sanityn env=ONLY=77
Signed-off-by: Etienne AUJAMES <etienne.aujames@cea.fr>
Change-Id: I61e42267ae568f9a1eb6fe57937a5e96f1824010
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48235
Reviewed-by: Qian Yingjin <qian@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>