HBASE-5923 Cleanup checkAndXXX logic



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1555351 13f79535-47bb-0310-9956-ffa450edef68
Add apple meetup

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1555460 13f79535-47bb-0310-9956-ffa450edef68