Remove scheduler RPC API version 1.x

Like with the compute RPC API, we're unlikely to still work well with
RPC client using older 1.x version because of DB schema changes.

In that case, we may as well remove 1.x support in Folsom and rip out
the potentially buggy backwards compat code. This should also make
backporting fixes from Grizzly easier.

Deployers following trunk can upgrade all their nodes to use the version
2.0 API before deploying this commit.

Change-Id: Iee099751bda9637da5e134357d28e89d5fba9895

nova/scheduler/multi.py

@@ -65,11 +65,6 @@ class MultiScheduler(driver.Scheduler):
                         'volume': volume_driver,
                         'default': default_driver}
 
-    def schedule(self, context, topic, method, *_args, **_kwargs):
-        driver = self.drivers.get(topic, self.drivers['default'])
-        return driver.schedule(context, topic,
-                method, *_args, **_kwargs)
-
     def schedule_run_instance(self, *args, **kwargs):
         return self.drivers['compute'].schedule_run_instance(*args, **kwargs)