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/plugins/host.py

@@ -554,7 +554,7 @@ class host(LDAPObject):
         ),
         Str('macaddress*',
             normalizer=lambda value: value.upper(),
-            pattern='^([a-fA-F0-9]{2}[:|\-]?){5}[a-fA-F0-9]{2}$',
+            pattern=r'^([a-fA-F0-9]{2}[:|\-]?){5}[a-fA-F0-9]{2}$',
             pattern_errmsg=('Must be of the form HH:HH:HH:HH:HH:HH, where '
                             'each H is a hexadecimal character.'),
             label=_('MAC address'),