HBASE-7967 implement compactor for stripe compactions - ADDENDUM - fix javadoc warnings

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1536881 13f79535-47bb-0310-9956-ffa450edef68
Fixes according to changes in trunk
Merge branch 'trunk' into fb-YAHOO-313-trunk-gd
Set default realm to prevent kerberos initialization errors