Add absolute_import future imports

Add absolute_import from __future__ so that pylint
does not fail and to achieve python3 behavior in
python2.

Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipaplatform/base/services.py

@@ -23,6 +23,8 @@ This base module contains default implementations of IPA interface for
 interacting with system services.
 '''
 
+from __future__ import absolute_import
+
 import os
 import json
 import time

ipaplatform/base/tasks.py

@@ -22,6 +22,8 @@
 This module contains default platform-specific implementations of system tasks.
 '''
 
+from __future__ import absolute_import
+
 import logging
 
 from pkg_resources import parse_version