Fix: Use unattended parameter instead of options.unattended

Attribute 'unattended' is not always present in 'options' so function
parameter 'unattended' should be used.

https://fedorahosted.org/freeipa/ticket/5563

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipaserver/install/bindinstance.py

@@ -463,7 +463,7 @@ def check_reverse_zones(ip_addresses, reverse_zones, options, unattended,
                 ipautil.check_zone_overlap(rz)
             except ValueError as e:
                 msg = "Reverse zone %s will not be used: %s" % (rz, e)
-                if options.unattended:
+                if unattended:
                     sys.exit(msg)
                 else:
                     root_logger.warning(msg)