HBASE-9247 Cleanup Key/KV/Meta/MetaKey Comparators


git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1518817 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9380 StoreFile.Reader is not being closed on memstore flush

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1518827 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HBASE-8584-trunk-gd