Allow specification of public UDP ports

The iptables class allowed specifying a list of public UDP ports,
just like it has support for TCP.  However, a couple of places needed
to be updated to pass through the UDP port list to make it usable.

Change-Id: I00764bf1d7baff862fa51a6cd03211fe9a29ecdd
Set up basic Asterisk configuration

This commit sets up the basic configuration for Asterisk.  It will allow
Asterisk to run, but it won't do anything useful yet.

Change-Id: I7975082ff5351db4dc6e3c8cf9dd2d90675e3108
Merge "Allow specification of public UDP ports"
Merge "Set up basic Asterisk configuration"