LU-9917 lnet: rediscover peer if it changed

LU-9917 lnet: rediscover peer if it changed

If the peer has changed after we unlocked the cpt then
we'll need to discover the new peer.

Signed-off-by: Amir Shehata <amir.shehata@intel.com>
Change-Id: Ib880746d5e67bbea1aa43122fa3aa115261c8664
Reviewed-on: https://review.whamcloud.com/28772
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>