HBASE-8670 [0.94] Backport HBASE-8449,HBASE-8204 and HBASE-8699 to 0.94 (Refactor recoverLease retries and pauses)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1509532 13f79535-47bb-0310-9956-ffa450edef68