Fix create delete test for rebalance logic #982
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Fix create delete test for rebalance logic
In #980, the removal of the failover state transition rendered the test awkward. The initial state and the state described as "failover" became identical, allowing the test to pass even if no monitor action occurred in response to gateway deletions.
Parallelized the check for healthy gateways and their subsystems. Each parallel task first verifies the "failover" number of groups and then confirms the "rebalance" number of group in degraded state.
See #980 (comment)