Expand power state querying and resolution.

The get_info method only checks for running and shutdown instances.
However, when the periodical job for syncing instance power states
is run. The instance information and LXD can get out of sync.
So check translate the LXD power state against the nova power
state.

Change-Id: Ib805467e318c886c53bcb953ab368f6f5506534e
Signed-off-by: Chuck Short <chuck.short@canonical.com>

nova/tests/unit/virt/lxd/test_driver.py

@@ -36,7 +36,7 @@ MockResponse = collections.namedtuple('Response', ['status_code'])
 
 MockContainer = collections.namedtuple('Container', ['name'])
 MockContainerState = collections.namedtuple(
-    'ContainerState', ['status', 'memory'])
+    'ContainerState', ['status', 'memory', 'status_code'])
 
 
 def fake_connection_info(volume, location, iqn, auth=False, transport=None):
@@ -65,6 +65,33 @@ def fake_connection_info(volume, location, iqn, auth=False, transport=None):
     return ret
 
 
+class GetPowerStateTest(test.NoDBTestCase):
+    """Tests for nova.virt.lxd.driver.LXDDriver."""
+
+    def test_running(self):
+        state = driver._get_power_state(100)
+        self.assertEqual(power_state.RUNNING, state)
+
+    def test_shutdown(self):
+        state = driver._get_power_state(102)
+        self.assertEqual(power_state.SHUTDOWN, state)
+
+    def test_nostate(self):
+        state = driver._get_power_state(105)
+        self.assertEqual(power_state.NOSTATE, state)
+
+    def test_crashed(self):
+        state = driver._get_power_state(108)
+        self.assertEqual(power_state.CRASHED, state)
+
+    def test_suspended(self):
+        state = driver._get_power_state(109)
+        self.assertEqual(power_state.SUSPENDED, state)
+
+    def test_unknown(self):
+        self.assertRaises(ValueError, driver._get_power_state, 69)
+
+
 class LXDDriverTest(test.NoDBTestCase):
     """Tests for nova.virt.lxd.driver.LXDDriver."""
 
@@ -121,7 +148,7 @@ class LXDDriverTest(test.NoDBTestCase):
     def test_get_info(self):
         container = mock.Mock()
         container.state.return_value = MockContainerState(
-            'Running', {'usage': 4000, 'usage_peak': 4500})
+            'Running', {'usage': 4000, 'usage_peak': 4500}, 100)
         self.client.containers.get.return_value = container
 
         ctx = context.get_admin_context()