WIP: zope4: ZServer removal: Remove TimerServer old code.

product/TimerService/timerserver/__init__.py

-import six
-if six.PY2:
-  from ZServer.datatypes import ServerFactory
-
-  class TimerServerFactory(ServerFactory):
-      def __init__(self, section):
-          ServerFactory.__init__(self)
-          self.interval = section.interval
-
-      def create(self):
-          from .TimerServer import TimerServer
-          return TimerServer(self.module, self.interval)