LU-14654 tests: Ensure recovery_limit zero works as expected

LU-14654 tests: Ensure recovery_limit zero works as expected

When lnet_recovery_limit is set to zero (the default) peer NIs are
eligible for recovery pings indefinitely. Verify this functionality
by modifying sanity-lnet test_211 to use recovery_limit 0 to make
a peer NI re-eligible for recovery.

Lustre-change: https://review.whamcloud.com/43502
Lustre-commit: 8d1895f2f69bd2eec3ff6af5eb356740fa2c8766

Test-Parameters: trivial testlist=sanity-lnet
HPE-bug-id: LUS-9953
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I00cb0940133e15ec73491e875d08b6db2bff3fe5
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54449
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>