pytest: Migrate unittest/nose to Pytest fixtures

Even though Pytest supports xunit style setups, unittest and nose
tests, this support is limited and may be dropped in the future
releases. Worst of all is that the mixing of various test
frameworks results in weird conflicts and of course, is not widely
tested.

This is a part of work to remove the mixing of test idioms in the
IPA's test suite:
1) replace unittest.TestCase subclasses
2) replace unittest test controls (SkipTest, fail, etc.)
3) replace unittest assertions

Related: https://pagure.io/freeipa/issue/7989
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipatests/test_cmdline/cmdline.py

@@ -25,7 +25,6 @@ from __future__ import absolute_import
 
 import distutils.spawn
 import os
-import unittest
 
 import pytest
 
@@ -69,6 +68,6 @@ class cmdline_test(XMLRPC_test):
                 'Command %r not available' % original_command
             )
         if not server_available:
-            raise unittest.SkipTest(
+            pytest.skip(
                 'Server not available: %r' % api.env.xmlrpc_uri
             )