Backport "HBASE-23561 Look up of Region in Master by encoded region name is O(n)" to branch-2.5#5070

ndimiduk merged 2 commits intoapache:branch-2.5apache/hbase:branch-2.5from

ndimiduk:23561-master-region-by-region-name-O-n-branch-2.5ndimiduk/hbase:23561-master-region-by-region-name-O-n-branch-2.5Copy head branch name to clipboard