Bug#690889: udhcpc always returns a domain of "bad" when receiving a valid dhcp ack packet

[Ben Hildred <ben@hildred.us>]

Package: udhcpc
Followup-For: Bug #690889

This is reliably triggered by setting `get-lease-hostnames true;` in dhcpd.conf when using bind9 fore reverse lookups as bind9 returns a trailing dot.