HBASE-7763 Compactions not sorting based on size anymore.

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1444977 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7821 Remove Duplicated code in CompactSelection

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1444998 13f79535-47bb-0310-9956-ffa450edef68