Merge r1516556 from trunk:

* r1516556
  svnserve: Fix creation of pid files.
  Votes:
    +1: danielsh, breser, philip


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1516557 13f79535-47bb-0310-9956-ffa450edef68