Fix OSC networking commands help errors

OSC networking commands need to authenticate to get
service catalog, then decide to show nova-network or
neutron command help message. Fake token and fake
auth_type in prepare_to_run_command() casue os-cloud-config
use AdminToken auth plugin, but pass all the auth information
(include: username, password and so on) to it, that casue the
class initialization error. Pop the fake token and url, then
try to load auth plugin again to fix the issue.

Change-Id: I8b140f0b0a60681fc2a35a013bb0c84ff8cb9589
Closes-Bug: #1650026

openstackclient/common/clientmanager.py

@@ -59,6 +59,8 @@ class ClientManager(clientmanager.ClientManager):
         self._interface = self.interface
         self._cacert = self.cacert
         self._insecure = not self.verify
+        # store original auth_type
+        self._original_auth_type = cli_options.auth_type
 
     def setup_auth(self):
         """Set up authentication"""
@@ -73,12 +75,33 @@ class ClientManager(clientmanager.ClientManager):
         if self._cli_options._openstack_config is not None:
             self._cli_options._openstack_config._pw_callback = \
                 shell.prompt_for_password
+            try:
+                self._cli_options._auth = \
+                    self._cli_options._openstack_config.load_auth_plugin(
+                        self._cli_options.config,
+                    )
+            except TypeError as e:
+                self._fallback_load_auth_plugin(e)
+
+        return super(ClientManager, self).setup_auth()
+
+    def _fallback_load_auth_plugin(self, e):
+        # NOTES(RuiChen): Hack to avoid auth plugins choking on data they don't
+        #                 expect, delete fake token and endpoint, then try to
+        #                 load auth plugin again with user specified options.
+        #                 We know it looks ugly, but it's necessary.
+        if self._cli_options.config['auth']['token'] == 'x':
+            # restore original auth_type
+            self._cli_options.config['auth_type'] = \
+                self._original_auth_type
+            del self._cli_options.config['auth']['token']
+            del self._cli_options.config['auth']['endpoint']
             self._cli_options._auth = \
                 self._cli_options._openstack_config.load_auth_plugin(
                     self._cli_options.config,
                 )
-
-        return super(ClientManager, self).setup_auth()
+        else:
+            raise e
 
     def is_network_endpoint_enabled(self):
         """Check if the network endpoint is enabled"""

openstackclient/tests/functional/common/test_help.py

@@ -64,3 +64,10 @@ class HelpTests(base.TestCase):
         raw_output = self.openstack('help server')
         for command in [row[0] for row in self.SERVER_COMMANDS]:
             self.assertIn(command, raw_output)
+
+    def test_networking_commands_help(self):
+        """Check networking related commands in help message."""
+        raw_output = self.openstack('help network list')
+        self.assertIn('List networks', raw_output)
+        raw_output = self.openstack('network create --help')
+        self.assertIn('Create new network', raw_output)

releasenotes/notes/bug-1650026-0ce6a77e69d24424.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed a ``__init__() got an unexpected keyword argument 'project_name'``
+    error in various networking commands when ``help`` or ``--help`` was used.
+    [Bug `1650026 <https://bugs.launchpad.net/bugs/1650026>`_]