Test that we are setting region-name properly

We ran into a bug where we were not properly setting region-name. Lets
assert we do this.

Change-Id: I24426b8e04c8bff79a3f73e1dfcc4c7fbb0039b0

nodepool/tests/fixtures/node.yaml

@@ -22,6 +22,7 @@ labels:
 
 providers:
   - name: fake-provider
+    region-name: fake-region
     keypair: 'if-present-use-this-keypair'
     username: 'fake'
     password: 'fake'

nodepool/tests/test_shade_integration.py

@@ -38,6 +38,7 @@ class TestShadeIntegration(tests.IntegrationTestCase):
                      'password': 'fake',
                      'auth_url': 'fake'}
         self.assertEqual(provider_manager._client.auth, auth_data)
+        self.assertEqual(provider_manager._client.region_name, 'fake-region')
 
     def test_nodepool_osc_config(self):
         configfile = self.setup_config('node_osc.yaml')