MB-10509: Fix test case test_failover_log_behavior

Change-Id: I6c291210cbd3f8bf5689e02f8ee0c11836372545
Reviewed-on: http://review.couchbase.org/35021
Reviewed-by: abhinav dangeti <abhinav@couchbase.com>
Tested-by: abhinav dangeti <abhinav@couchbase.com>