Delay the thread-start in case the process needs to fork/daemonize itself first.
Delay the thread-start in case the process needs to fork/daemonize
itself first.

* tools/server-side/svnpubsub/svnwcsub.py:
  (BackgroundWorker.__init__): initialize a flag indicating whether
    we've started ourself or not.
  (BackgroundWorker.add_work): possibly start when work arrives


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1296023 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion