Fix creation of pidfiles in svnwcsub.py like we already fixed in daemonize.py

* tools/server-side/svnpubsub/svnwcsub.py:
  (handle_options): In the foreground case create pidfile safely.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1516271 13f79535-47bb-0310-9956-ffa450edef68