Add a new base cli test class

This commit adds a new base test class for the cli testing framework.
This differs from the previous version in the tempest repo because it
uses an abstract method to initialize the client object. While in
tempest this was done inside the test class itself and leveraged the
config object.

Since the config object is being decoupled from the library defining
the test class this way allows any child test class to use whatever
credentials and previous config options directly in setup.

requirements.txt

@@ -3,3 +3,4 @@ Babel>=1.3
 fixtures>=0.3.14
 oslo.config>=1.4.0.0a3
 iso8601>=0.1.9
+testresources>=0.2.4

tempest_lib/cli/base.py

@@ -20,6 +20,7 @@ import subprocess
 
 import testtools
 
+from tempest_lib import base
 import tempest_lib.cli.output_parser
 from tempest_lib import exceptions
 from tempest_lib.openstack.common import log as logging
@@ -92,7 +93,6 @@ class CLIClientBase(object):
     def __init__(self, username='', password='', tenant_name='', uri='',
                  cli_dir='', *args, **kwargs):
         super(CLIClientBase, self).__init__()
-        self.parser = tempest_lib.cli.output_parser
         self.cli_dir = cli_dir if cli_dir else '/usr/bin'
         self.username = username
         self.tenant_name = tenant_name
@@ -190,3 +190,14 @@ class CLIClientBase(object):
         self.assertTrue(lines[0].startswith(beginning),
                         msg=('Beginning of first line has invalid content: %s'
                              % lines[:3]))
+
+
+class ClientTestBase(base.BaseTestCase):
+
+    def setUp(self):
+        super(ClientTestBase, self).setUp()
+        self.clients = self._get_clients()
+        self.parser = tempest_lib.cli.output_parser
+
+    def _get_clients(self):
+        raise NotImplementedError