Removes several pylint warnings.

This patche removes 93 pylint deprecation warnings due to invalid escape
sequences (mostly 'invalid escape sequence \d') on unicode strings.

Signed-off-by: Rafael Guterres Jeffman <rjeffman@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipaserver/dcerpc.py

@@ -22,7 +22,7 @@
 # Make sure we only run this module at the server where samba4-python
 # package is installed to avoid issues with unavailable modules
 
-from __future__ import absolute_import
+from __future__ import absolute_import, unicode_literals
 
 import logging
 import re

ipaserver/dns_data_management.py

@@ -2,7 +2,7 @@
 # Copyright (C) 2016  FreeIPA Contributors see COPYING for license
 #
 
-from __future__ import absolute_import
+from __future__ import absolute_import, unicode_literals
 
 import logging
 

ipatests/test_xmlrpc/test_external_members.py

@@ -21,6 +21,8 @@ Test adding/removing external members (trusted domain objects) to IPA groups.
 These tests are skipped if trust is not established.
 """
 
+from __future__ import unicode_literals
+
 import unittest
 
 from ipalib import api