LU-12857 tests: allow clients to be IDLE after recovery

LU-12857 tests: allow clients to be IDLE after recovery

If clients are not connected to an OST when it fails (connection
is IDLE), they do not need to be involved in recovery, so this
should not be considered an error when checking the client state.

Test-Parameters: trivial testlist=recovery-mds-scale env=SLOW=no
Test-Parameters: testlist=conf-sanity
Test-Parameters: testlist=replay-dual,replay-single
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I6cfeb718acd233378ed1608f22061bc15c3ebbe5
Reviewed-on: https://review.whamcloud.com/45318
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>