Network: Improve no option test for "network create".

Currently, test_create_no_options() case actually takes a 'name' arg.
Rename it to test_create_default_options, and add a test_create_no_options
case taking nothing.

Change-Id: I4f9d2e8cbfa843faea641d3cc959f96894c9cd5d

openstackclient/tests/network/v2/test_network.py

@@ -93,6 +93,16 @@ class TestCreateNetworkIdentityV3(TestNetwork):
         )
 
     def test_create_no_options(self):
+        arglist = []
+        verifylist = []
+
+        try:
+            # Missing required args should bail here
+            self.check_parser(self.cmd, arglist, verifylist)
+        except tests_utils.ParserException:
+            pass
+
+    def test_create_default_options(self):
         arglist = [
             self._network.name,
         ]