info: infoldap: allow anonymous binding
This patch will make it possible to bind anonymously.
python-ldap wants no arguments to simple_bind_s for anonymous binds,
and passing None for bind_dn and password does not imply anonymous binding.
Fixes: #205
Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>
Reviewed-by: Rob Crittenden <rcritten@redhat.com>