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_ipaserver/test_ldap.py

@@ -29,7 +29,6 @@ from __future__ import absolute_import
 
 import os
 import sys
-import unittest
 
 import pytest
 import six
@@ -92,7 +91,7 @@ class test_ldap:
             with open(pwfile, "r") as fp:
                 dm_password = fp.read().rstrip()
         else:
-            raise unittest.SkipTest(
+            pytest.skip(
                 "No directory manager password in %s" % pwfile
             )
         self.conn = ldap2(api)
@@ -118,7 +117,7 @@ class test_ldap:
             with open(pwfile, "r") as fp:
                 dm_password = fp.read().rstrip()
         else:
-            raise unittest.SkipTest(
+            pytest.skip(
                 "No directory manager password in %s" % pwfile
             )
         myapi.Backend.ldap2.connect(bind_dn=DN(('cn', 'Directory Manager')), bind_pw=dm_password)
@@ -136,7 +135,7 @@ class test_ldap:
         try:
             self.conn.connect(autobind=True)
         except errors.ACIError:
-            raise unittest.SkipTest("Only executed as root")
+            pytest.skip("Only executed as root")
         entry_attrs = self.conn.get_entry(self.dn, ['usercertificate'])
         cert = entry_attrs.get('usercertificate')[0]
         assert cert.serial_number is not None