HBASE-9508 Restore some API mistakenly removed in client, mapred*, and common

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1523142 13f79535-47bb-0310-9956-ffa450edef68
hbase-9390: coprocessors observers are not called during a recovery with the new log replay algorithm - 1

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1523173 13f79535-47bb-0310-9956-ffa450edef68