Pass network API to the conducor's MigrationTask

During migration conductor needs to heal the content of the
RequestSpec.requested_resources field based on the resource requests of
the ports attached to the instance being migrated.

This patch makes sure that the MigrationTask has access the networking
API to do such healing.

blueprint: support-move-ops-with-qos-ports

Change-Id: Idf38568c3c237687c54fbbfcc6c5792c49c95161

Author: Balazs Gibizer

nova/conductor/manager.py

@@ -485,7 +485,7 @@ def _build_cold_migrate_task(self, context, instance, flavor, request_spec,
                                      request_spec, clean_shutdown,
                                      self.compute_rpcapi,
                                      self.query_client, self.report_client,
-                                     host_list)
+                                     host_list, self.network_api)
 
     def _destroy_build_request(self, context, instance):
         # The BuildRequest needs to be stored until the instance is mapped to

nova/conductor/tasks/migrate.py

@@ -112,7 +112,7 @@ def revert_allocation_for_migration(context, source_cn, instance, migration):
 class MigrationTask(base.TaskBase):
     def __init__(self, context, instance, flavor,
                  request_spec, clean_shutdown, compute_rpcapi,
-                 query_client, report_client, host_list):
+                 query_client, report_client, host_list, network_api):
         super(MigrationTask, self).__init__(context, instance)
         self.clean_shutdown = clean_shutdown
         self.request_spec = request_spec
@@ -122,6 +122,7 @@ def __init__(self, context, instance, flavor,
         self.query_client = query_client
         self.reportclient = report_client
         self.host_list = host_list
+        self.network_api = network_api
 
         # Persist things from the happy path so we don't have to look
         # them up if we need to roll back

nova/tests/unit/conductor/tasks/test_migrate.py

@@ -60,14 +60,17 @@ def setUp(self):
         self.ensure_network_metadata_mock = _p.start()
         self.addCleanup(_p.stop)
 
+        self.mock_network_api = mock.Mock()
+
     def _generate_task(self):
         return migrate.MigrationTask(self.context, self.instance, self.flavor,
                                      self.request_spec,
                                      self.clean_shutdown,
                                      compute_rpcapi.ComputeAPI(),
                                      query.SchedulerQueryClient(),
                                      report.SchedulerReportClient(),
-                                     host_list=None)
+                                     host_list=None,
+                                     network_api=self.mock_network_api)
 
     @mock.patch.object(objects.MigrationList, 'get_by_filters')
     @mock.patch('nova.scheduler.client.report.SchedulerReportClient')