OAK-2040 Tar compaction: log a warning if there is more than one checkpoint
 - added warn message when there is more than one checkpoint

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1619823 13f79535-47bb-0310-9956-ffa450edef68
OAK-2040 Tar compaction: log a warning if there is more than one checkpoint
 - forgot to add a file



git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1619824 13f79535-47bb-0310-9956-ffa450edef68