Add minimum_version decorators on NetworkApi methods

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

docker/api/network.py

@@ -1,9 +1,10 @@
 import json
 
-from ..utils import check_resource
+from ..utils import check_resource, minimum_version
 
 
 class NetworkApiMixin(object):
+    @minimum_version('1.21')
     def networks(self, names=None, ids=None):
         filters = {}
         if names:
@@ -17,6 +18,7 @@ class NetworkApiMixin(object):
         res = self._get(url, params=params)
         return self._result(res, json=True)
 
+    @minimum_version('1.21')
     def create_network(self, name, driver=None):
         data = {
             'name': name,
@@ -26,23 +28,27 @@ class NetworkApiMixin(object):
         res = self._post_json(url, data=data)
         return self._result(res, json=True)
 
+    @minimum_version('1.21')
     def remove_network(self, net_id):
         url = self._url("/networks/{0}", net_id)
         res = self._delete(url)
         self._raise_for_status(res)
 
+    @minimum_version('1.21')
     def inspect_network(self, net_id):
         url = self._url("/networks/{0}", net_id)
         res = self._get(url)
         return self._result(res, json=True)
 
     @check_resource
+    @minimum_version('1.21')
     def connect_container_to_network(self, container, net_id):
         data = {"container": container}
         url = self._url("/networks/{0}/connect", net_id)
         self._post_json(url, data=data)
 
     @check_resource
+    @minimum_version('1.21')
     def disconnect_container_from_network(self, container, net_id):
         data = {"container": container}
         url = self._url("/networks/{0}/disconnect", net_id)