LU-17166 ptlrpc: add pb_projid field in ptlrpc_body

LU-17166 ptlrpc: add pb_projid field in ptlrpc_body

This patch "tags" ptlrpc requests with projid (with pb_projid field in
ptlrpc_body). This will enable to add server projid stats and TBF
scheduling based on projid.

The projid comes from the inode (struct ll_inode_info::lli_projid).
For MDT request by name (lookup/create), if the parent have the projid
inherit flag ("LLIF_PROJECT_INHERIT"), the request will be "tag" with
the parent projid.

To build an OSC request, cl_req_projid_set() is added to retrieve the
projid from the VPP layer.

Signed-off-by: Etienne AUJAMES <eaujames@ddn.com>
Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: I98a73023268a5f24549e3204d6d42a3f057a0798
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54920
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>