* plugin/hosts provide more configuration flexibility
This patch adds few features to the host plugin
* no-reverse (both as first argument on the plugin line and inline)
disable the automatic generation of reserve entries for hosts
* ttl <duration> (inline only atm)
allows to change the default ttl (default 5 minutes)
* reload <duration> (inline only atm)
allows to change the reloading interval (default 5s)
* plugin/hosts remove superfluous parameters to parse