Fix v2 so that you can see the default help info

you can see the default help informatiion is v2
subcommand information if input glance command

Co-Authored-By: Stuart McLaren <stuart.mclaren@hp.com>

Closes-bug: #1563649
Change-Id: I7d227f3e68aa555b2e25848618f76df4872af35d

glanceclient/shell.py

@@ -535,6 +535,7 @@ class OpenStackImagesShell(object):
         # Handle top-level --help/-h before attempting to parse
         # a command off the command line
         if options.help or not argv:
+            parser = _get_subparser(api_version)
             self.do_help(options, parser=parser)
             return 0
 

glanceclient/tests/unit/test_shell.py

@@ -523,9 +523,14 @@ class ShellTest(testutils.TestCase):
         except SystemExit:
             self.fail('Unexpected SystemExit')
 
-        # We expect the normal usage as a result
-        self.assertIn('Command-line interface to the OpenStack Images API',
-                      sys.stdout.getvalue())
+        # We expect the normal v2 usage as a result
+        expected = ['Command-line interface to the OpenStack Images API',
+                    'image-list',
+                    'image-deactivate',
+                    'location-add']
+        for output in expected:
+            self.assertIn(output,
+                          sys.stdout.getvalue())
 
 
 class ShellTestWithKeystoneV3Auth(ShellTest):