Add connectivity check test for migration

This test creates a guest and execute a cold migration on it.  Network
connectivity is validated after the confirm resize.

Change-Id: I5ca723dd2e93ed6a274084564d96719886e3d0ab
diff --git a/tempest/scenario/test_network_advanced_server_ops.py b/tempest/scenario/test_network_advanced_server_ops.py
index 60b030d..0605902 100644
--- a/tempest/scenario/test_network_advanced_server_ops.py
+++ b/tempest/scenario/test_network_advanced_server_ops.py
@@ -35,6 +35,12 @@
     """
 
     @classmethod
+    def setup_clients(cls):
+        super(TestNetworkAdvancedServerOps, cls).setup_clients()
+        cls.admin_servers_client = cls.os_adm.servers_client
+        cls.admin_hosts_client = cls.os_adm.hosts_client
+
+    @classmethod
     def skip_checks(cls):
         super(TestNetworkAdvancedServerOps, cls).skip_checks()
         if not (CONF.network.project_networks_reachable
@@ -94,6 +100,10 @@
                                        'ACTIVE')
         self._check_network_connectivity(server, keypair, floating_ip)
 
+    def _get_host_for_server(self, server_id):
+        body = self.admin_servers_client.show_server(server_id)['server']
+        return body['OS-EXT-SRV-ATTR:host']
+
     @test.idempotent_id('61f1aa9a-1573-410e-9054-afa557cab021')
     @test.services('compute', 'network')
     def test_server_connectivity_stop_start(self):
@@ -184,3 +194,29 @@
         self.servers_client.confirm_resize_server(server['id'])
         self._wait_server_status_and_check_network_connectivity(
             server, keypair, floating_ip)
+
+    @test.idempotent_id('a4858f6c-401e-4155-9a49-d5cd053d1a2f')
+    @testtools.skipUnless(CONF.compute_feature_enabled.cold_migration,
+                          'Cold migration is not available.')
+    @test.services('compute', 'network')
+    def test_server_connectivity_cold_migration(self):
+        if CONF.compute.min_compute_nodes < 2:
+            msg = "Less than 2 compute nodes, skipping multinode tests."
+            raise self.skipException(msg)
+
+        keypair = self.create_keypair()
+        server = self._setup_server(keypair)
+        floating_ip = self._setup_network(server, keypair)
+        src_host = self._get_host_for_server(server['id'])
+        self._wait_server_status_and_check_network_connectivity(
+            server, keypair, floating_ip)
+
+        self.admin_servers_client.migrate_server(server['id'])
+        waiters.wait_for_server_status(self.servers_client, server['id'],
+                                       'VERIFY_RESIZE')
+        self.servers_client.confirm_resize_server(server['id'])
+        self._wait_server_status_and_check_network_connectivity(
+            server, keypair, floating_ip)
+        dst_host = self._get_host_for_server(server['id'])
+
+        self.assertNotEqual(src_host, dst_host)