support for haproxy

[frisi]

feature request:
having a plugin for haproxy would be nice.

currently i'm using a perl based one
http://munin-monitoring.org/browser/munin/plugins/node.d/haproxy_.in

yould be great to be able to stick with the pymunin package and be done though.

there is another one
http://munin-monitoring.org/browser/munin/plugins/node.d/haproxy_ng.in

and some bash scripts on https://github.com/munin-monitoring/contrib/tree/master/plugins/haproxy