This will allows to use it for several different external method
calls

As zabbix agentd cannot run in foreground mode wrap it in simple foreground
application which sends singals whenever it is requested to be killed.

Instantiation shall depend on minimal tools, like system administrator would.

Superseded by buildout:allow-hosts, was not functional anyway.

Most of required eggs are anyway available on pypi, which is much more
reliable than all scattered sources. Idea by Leonardo.