HBASE-12549 Fix TestAssignmentManagerOnCluster#testAssignRacingWithSSH() flaky test
HBASE-12541 Add misc debug logging to hanging tests in TestHCM and TestBaseLoadBalancer
HBASE-12346 Scan's default auths behavior under Visibility labels.(Jerry He)
HBASE-12346 Scan's default auths behavior under Visibility labels. - Addendum