Create test owner for presence service

This owner changes properties periodically so we can test out the PS's handling
of property changes.  To execute, run Sugar and then make sure that the D-Bus
address is the one sugar is using (get it from ~/.sugar/default/session.info).
Then run:

build/bin/sugar-presence-service X

where X is a number 1 -> 9 inclusive.  It will generate fake buddy info for that
test buddy and then start up a presence service for that buddy, changing a random
property of the buddy every 10 seconds.

services/presence/presenceservice.py

@@ -25,7 +25,7 @@ from server_plugin import ServerPlugin
 from linklocal_plugin import LinkLocalPlugin
 from sugar import util
 
-from buddy import Buddy, Owner
+from buddy import Buddy, ShellOwner, TestOwner
 from activity import Activity
 
 _PRESENCE_SERVICE = "org.laptop.Sugar.Presence"
@@ -40,7 +40,7 @@ class NotFoundError(dbus.DBusException):
 
 
 class PresenceService(dbus.service.Object):
-    def __init__(self):
+    def __init__(self, test=0):
         self._next_object_id = 0
 
         self._buddies = {}      # key -> Buddy
@@ -52,7 +52,10 @@ class PresenceService(dbus.service.Object):
 
         # Create the Owner object
         objid = self._get_next_object_id()
-        self._owner = Owner(self._bus_name, objid)
+        if test > 0:
+            self._owner = TestOwner(self._bus_name, objid, test)
+        else:
+            self._owner = ShellOwner(self._bus_name, objid)
         self._buddies[self._owner.props.key] = self._owner
 
         self._registry = ManagerRegistry()
@@ -326,9 +329,9 @@ class PresenceService(dbus.service.Object):
             activity.set_properties(props)
 
 
-def main():
+def main(test=False):
     loop = gobject.MainLoop()
-    ps = PresenceService()
+    ps = PresenceService(test)
     try:
         loop.run()
     except KeyboardInterrupt: