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

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1486104 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/trunk@1486108 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd