[0.89-fb] [master] Ensure that we clear the openingRegions for a particular region; if there is an error for some reason

Author: aaiyer

Summary: If for some reason region open fails; we should clean up the openingRegions

Test Plan: run unit tests

Reviewers: rshroff, liyintang

Reviewed By: liyintang

CC: hbase-eng@

Differential Revision: https://phabricator.fb.com/D823512

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1486349 13f79535-47bb-0310-9956-ffa450edef68
[0.89-fb] [HBASE-8228] Revert temporary diffs that were introduced to instrument snapshot

Author: aaiyer

Summary:
Revert temporary diffs that were introduced to instrument snapshot
revert 1st diff e137cf15335aca2d4f33e6bc20141d83adfbcfba
revert 770ebd720932584f30d84583685b544df80d1ba7
revert 9f768c7173734dd47d18d1887f3360f035927d3f

Test Plan: unit tests

Reviewers: rshroff

Reviewed By: rshroff

CC: hbase-eng@

Differential Revision: https://phabricator.fb.com/D824880

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1486350 13f79535-47bb-0310-9956-ffa450edef68