Add support for creating internal networks

Signed-off-by: Jonathan Giannuzzi <jonathan@giannuzzi.be>

compose/config/config_schema_v2.0.json

@@ -246,7 +246,8 @@
             "name": {"type": "string"}
           },
           "additionalProperties": false
-        }
+        },
+        "internal": {"type": "boolean"}
       },
       "additionalProperties": false
     },

compose/network.py

@@ -15,7 +15,7 @@ log = logging.getLogger(__name__)
 
 class Network(object):
     def __init__(self, client, project, name, driver=None, driver_opts=None,
-                 ipam=None, external_name=None):
+                 ipam=None, external_name=None, internal=False):
         self.client = client
         self.project = project
         self.name = name
@@ -23,6 +23,7 @@ class Network(object):
         self.driver_opts = driver_opts
         self.ipam = create_ipam_config_from_dict(ipam)
         self.external_name = external_name
+        self.internal = internal
 
     def ensure(self):
         if self.external_name:
@@ -68,6 +69,7 @@ class Network(object):
                 driver=self.driver,
                 options=self.driver_opts,
                 ipam=self.ipam,
+                internal=self.internal,
             )
 
     def remove(self):
@@ -115,6 +117,7 @@ def build_networks(name, config_data, client):
             driver_opts=data.get('driver_opts'),
             ipam=data.get('ipam'),
             external_name=data.get('external_name'),
+            internal=data.get('internal'),
         )
         for network_name, data in network_config.items()
     }