HBASE-8570 CompactSplitThread logs a CompactSplitThread but it does not have a toString

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1486105 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8449 Refactor recoverLease retries and pauses informed by findings over in hbase-8389

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1486107 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.95' into 0.95-gd