[in tools/server-side/svnpubsub]

Check the stream format number.

* svnpubsub/client.py
  (SvnpubsubClientException): New class.
  (JSONRecordHandler.feed): Check the format number, if an 'svnpubsub' record
    is present.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1434082 13f79535-47bb-0310-9956-ffa450edef68