LU-12125 llite: send file mode with rename RPC

LU-12125 llite: send file mode with rename RPC

In preparation for parallel rename operations, send renamed file mode
to the MDS in order to allow the rename locking to be more efficient.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I4691f30d151a8ff81e443d24109234341b3ebbe5
Reviewed-on: https://review.whamcloud.com/41184
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: Yingjin Qian <qian@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>