made bus config global and moved to system bus
diff --git a/bin/system_manager.py b/bin/system_manager.py
index 07de9c0..864688d 100644
--- a/bin/system_manager.py
+++ b/bin/system_manager.py
@@ -208,7 +208,7 @@
 
 if __name__ == '__main__':
     dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
-    bus = dbus.SessionBus()
+    bus = Openbmc.getDBus()
     name = dbus.service.BusName(DBUS_NAME,bus)
     obj = SystemManager(bus,OBJ_NAME)
     mainloop = gobject.MainLoop()