Added management of getip.sh to puppetmaster class

This script is used to generate (usually public) IP addresses for the nodes
based on their $fqdn fact. This is used by some modules such as
bacula::filedaemon when they exported firewall resources, and the $ipaddress
fact is useless because it points to a private IP address.

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>