LU-15374 tests: check FULL and IDLE for client import state

LU-15374 tests: check FULL and IDLE for client import state

The client-to-OST import state can be FULL or IDLE.

Lustre-change: https://review.whamcloud.com/49298
Lustre-commit: 25fb82eb413389b6023e0e61f7efb71e91d15c01

Test-Parameters: trivial testgroup=review-dne-part-3

Test-Parameters: trivial env=SLOW=no,FAILURE_MODE=HARD \
    clientcount=4 mdtcount=1 mdscount=2 osscount=2 \
    austeroptions=-R failover=true iscsi=1 \
    testlist=recovery-mds-scale

Fixes: 25606a2ce1 ("LU-15342 tests: escape "|"")
Fixes: 3da8f014fd ("LU-12857 tests: allow clients to be IDLE after recovery")
Fixes: 5a6ceb664f ("LU-7236 ptlrpc: idle connections can disconnect")

Change-Id: I3582ceb273d241ee71fe907f6d1423746e453faa
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50629
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>