adding zone forwards without restart

[Reindl Harald]

Am 29.09.2016 um 21:27 schrieb Frank Even:
> None of that works.  Nothing short of a restart of the daemon notices
> new forwarders added to the config.  That is inclusive of:
>
> rndc reconfig
> rndc reload
> rndc flushname $nameofforwardersadded
> rndc flush

our named instances are running chrooted and i defined a SIGHUP to 
realod the named configuration in the system-unit years just for no need 
to configure "rndc" and don't make it useable since we don't have a 
usecase for it at all

ExecReload=/usr/bin/kill -HUP $MAINPID