DHCPd dyndns clause seems to be broken

[ti-mo]

https://github.com/ti-mo/ansible-lanparty/blob/master/lp-dhcpd/templates/dhcpd.j2#L33-L35

Might be related to Ansible 2.0, but this block seemed to cause me some issues during my latest deployment. Also, there were issues with RNDC communication between ns and dhcp on the same host, needs some further investigation.