Remove unused imports

This patch removes unused imports, alse pylint has been configured to
check unused imports.

Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipapython/sysrestore.py

@@ -33,7 +33,6 @@ import string
 import six
 from six.moves.configparser import SafeConfigParser
 
-from ipapython import ipautil
 from ipaplatform.tasks import tasks
 from ipaplatform.paths import paths