Fix operator cloud get_nic_by_mac

Apparently, this method either never worked or was silently
broken at some point in the past, since we didn't have tests.

Added two tests and got the method back into working shape.

Change-Id: I26591549c082a2cd206f20fbcb7f1e3a1dde91c7

shade/operatorcloud.py

@@ -56,8 +56,9 @@ class OperatorCloud(openstackcloud.OpenStackCloud):
     def get_nic_by_mac(self, mac):
         # TODO(TheJulia): Query /ports?address=mac when converting
         try:
-            return self.manager.submit_task(
-                _tasks.MachineNodePortGet(port_id=mac))
+            return self._normalize_machine(
+                self.manager.submit_task(
+                    _tasks.MachinePortGetByAddress(address=mac)))
         except ironic_exceptions.ClientException:
             return None
 

shade/tests/unit/test_baremetal_ports.py

@@ -92,3 +92,30 @@ class TestBaremetalPort(base.IronicTestCase):
                           self.op_cloud.list_nics_for_machine,
                           self.fake_baremetal_node['uuid'])
         self.assert_calls()
+
+    def test_get_nic_by_mac(self):
+        mac = self.fake_baremetal_port['address']
+        query = 'detail?address=%s' % mac
+        self.register_uris([
+            dict(method='GET',
+                 uri=self.get_mock_url(resource='ports', append=[query]),
+                 json={'ports': [self.fake_baremetal_port]}),
+        ])
+
+        return_value = self.op_cloud.get_nic_by_mac(mac)
+
+        self.assertEqual(self.fake_baremetal_port, return_value)
+        self.assert_calls()
+
+    def test_get_nic_by_mac_failure(self):
+        mac = self.fake_baremetal_port['address']
+        query = 'detail?address=%s' % mac
+        self.register_uris([
+            dict(method='GET',
+                 uri=self.get_mock_url(resource='ports', append=[query]),
+                 json={'ports': []}),
+        ])
+
+        self.assertIsNone(self.op_cloud.get_nic_by_mac(mac))
+
+        self.assert_calls()