HBASE-11918 TestVisibilityLabelsWithDistributedLogReplay#testAddVisibilityLabelsOnRSRestart sometimes fails due to VisibilityController initialization not being recognized
HBASE-11839 TestRegionRebalance is flakey
HBASE-11923 Potential race condition in RecoverableZookeeper.checkZk() (Lars Hofhansl)
Merge remote-tracking branch 'remotes/origin/0.98' into 0.98