LU-15865 ptlrpc: don't report eviction for lwp

LU-15865 ptlrpc: don't report eviction for lwp

lwp connections aren't persistent, so they found themselves
"evicted" after target's restart, which is not correct.
don't confuse people with false error.

Test-Parameters: trivial
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: Ia995eac2c4e1323690f42147aedc74f8748eacf0
Reviewed-on: https://review.whamcloud.com/47374
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>