OAK-2049: ArrayIndexOutOfBoundsException in Segment.getRefId()
Merged r1625158

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1625225 13f79535-47bb-0310-9956-ffa450edef68
OAK-2099: AIOOBE in Segment#toString
Merged r1625224

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1625226 13f79535-47bb-0310-9956-ffa450edef68