tftpd-hpa does not accept IPv4 connections

[kelvk]

vagrant@bcpc-vm-bootstrap:~$ sudo netstat -pan | grep tftp
udp6       0      0 :::69                   :::*                                4046/in.tftpd   
unix  2      [ ]         DGRAM                    71382    4046/in.tftpd       

https://bugs.launchpad.net/ubuntu/+source/tftp-hpa/+bug/1448500