Network aliases are now part of the network dictionary

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

tests/fixtures/networks/network-aliases.yml

@@ -5,13 +5,11 @@ services:
     image: busybox
     command: top
     networks:
-      - front
-      - back
-
-    network_aliases:
       front:
-        - forward_facing
-        - ahead
+        aliases:
+          - forward_facing
+          - ahead
+      back:
 
 networks:
   front: {}

tests/unit/config/config_test.py

@@ -543,27 +543,6 @@ class ConfigTest(unittest.TestCase):
         assert services[1]['name'] == 'db'
         assert services[2]['name'] == 'web'
 
-    def test_invalid_network_alias(self):
-        config_details = build_config_details({
-            'version': '2',
-            'services': {
-                'web': {
-                    'image': 'busybox',
-                    'networks': ['hello'],
-                    'network_aliases': {
-                        'world': ['planet', 'universe']
-                    }
-                }
-            },
-            'networks': {
-                'hello': {},
-                'world': {}
-            }
-        })
-        with pytest.raises(ConfigurationError) as exc:
-            config.load(config_details)
-        assert 'not declared in the networks list' in exc.exconly()
-
     def test_config_build_configuration(self):
         service = config.load(
             build_config_details(