LU-13408 target: update in-memory per client data

LU-13408 target: update in-memory per client data

Some clients don't support recovery:
1. lightweight clients.
2. local clients on MDS which doesn't support "local_recovery".
3. OFD connect may cause transaction before export has valid
   last_rcvd slot.

Though such clients don't store per client data on disk, they
still need to update in memory per client data to allow reply
reconstruct and track saved LDLM locks (both local and remote) be
tracked by transaction number.

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: Id0082358e7720e5ef61f366682ae91282bd66d6d
Reviewed-on: https://review.whamcloud.com/38855
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>