LU-16988 mdd: update projid when merging layout

LU-16988 mdd: update projid when merging layout

When creating mirrors by the special directory ".lustre/fid",
the project ID could not be set correctly, which causes
wrong quota calculation for the projid.

Lustre-change: https://review.whamcloud.com/51859
Lustre-commit: bb2525b0ddf9190ae340552fa615833b735b61d3

Signed-off-by: Hongchao Zhang <hongchao@whamcloud.com>
Change-Id: Ia4c3a8973b8c467642e12629d36fa42d64162084
Reviewed-by: Sergey Cheremencev <scherementsev@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52303
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>