{DCP}: Rebalance stuck when cluster has buckets with high and low priority

1091

1. Create 7 Node cluster (10.6.2.144-150)
2. Create 3 standard buckets and 2 sasl buckets
3. To each bucket add 100 K items, 2 buckets are set to high pri, meanwhile 3 have low pri
4. Hard Failover 1 Node 10.6.2.146
5. Rebalance cluster after Failover

Rebalance in Step 5 hangs

Test Case:: ./testrunner -i ../palm.ini -t failover.failovertests.FailoverTests.test_failover_normal,replicas=1,graceful=False,num_failed_nodes=1,items=100000,standard_buckets=2,sasl_buckets=2,standard_bucket_priority=low:high,sasl_bucket_priority=low:high,dgm_run=True,failoverMaster=False,skip_cleanup=True,GROUP=P0

This will repro even for a 5 Node cluster. Can be tried with cluster run