Use the compute_rpcapi instance not the module

compute_rpcapi.get_console_pool_info is only available from
the ComputeAPI object, not nova.compute.rpcapi module.

Partially fix bug 1037183

Change-Id: I57df710389bf349c7ba1dd7980105222918bff92

nova/console/manager.py

@@ -123,7 +123,7 @@ def get_pool_for_instance_host(self, context, instance_host):
                              'username': 'test',
                              'password': '1234pass'}
             else:
-                pool_info = compute_rpcapi.get_console_pool_info(context,
+                pool_info = self.compute_rpcapi.get_console_pool_info(context,
                         console_type, instance_host)
             pool_info['password'] = self.driver.fix_pool_password(
                                                     pool_info['password'])