intg: Use bytes for value of attributes in ldif
Python3 version of ldap module require string for name of attribute
but bytes for value of attribute. It was not a problem in python2
due to unicode changes in python3
Reviewed-by: Martin Basti <mbasti@redhat.com>
(cherry picked from commit 1097a61a8d4a892e126d14631c1b80fc1a5ce976)