Add default labels to networks and volumes created by Compose

Signed-off-by: Joffrey F <joffrey@docker.com>

tests/integration/network_test.py

@@ -0,0 +1,17 @@
+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+from .testcases import DockerClientTestCase
+from compose.const import LABEL_NETWORK
+from compose.const import LABEL_PROJECT
+from compose.network import Network
+
+
+class NetworkTest(DockerClientTestCase):
+    def test_network_default_labels(self):
+        net = Network(self.client, 'composetest', 'foonet')
+        net.ensure()
+        net_data = net.inspect()
+        labels = net_data['Labels']
+        assert labels[LABEL_NETWORK] == net.name
+        assert labels[LABEL_PROJECT] == net.project