Merge r1479896 from trunk:

 * r1479896
   Sort directory entries in output of 'svnlook tree'.
   Justification:
     Unstable APR hash order causes unstable output.
   Votes:
     +1: stsp, rhuijben, danielsh



git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1482444 13f79535-47bb-0310-9956-ffa450edef68