Quagga routing suite

Here's a formula for the current stable version of Quagga.

The long ``./configure`` enables all the daemons/protocols and especially the remote admin/CLI tool ``vtysh``, which is used to remotely administer these daemons and general routing on other routers (as well as maybe locally).

Thanks to mistym on IRC
Will the user need to set up a `quagga` user and group for this to work?