Standardize handling of verbose param in inspect_network

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

docker/api/network.py

@@ -168,24 +168,23 @@ class NetworkApiMixin(object):
         self._raise_for_status(res)
 
     @minimum_version('1.21')
-    def inspect_network(self, net_id, verbose=False):
+    def inspect_network(self, net_id, verbose=None):
         """
         Get detailed information about a network.
 
         Args:
             net_id (str): ID of network
-            verbose (bool): If set shows the service details across the cluster
-                in swarm mode
+            verbose (bool): Show the service details across the cluster in
+                swarm mode.
         """
-        if verbose is True:
+        params = {}
+        if verbose is not None:
             if version_lt(self._version, '1.28'):
-                raise InvalidVersion(
-                    'Verbose option was introduced in API 1.28'
-                )
-            url = self._url("/networks/{0}?verbose=true", net_id)
-        else:
-            url = self._url("/networks/{0}", net_id)
-        res = self._get(url)
+                raise InvalidVersion('verbose was introduced in API 1.28')
+            params['verbose'] = verbose
+
+        url = self._url("/networks/{0}", net_id)
+        res = self._get(url, params=params)
         return self._result(res, json=True)
 
     @check_resource