needs for environments with ipv4 and ipv6 enabled.
`hostname` could be differnt to `$PRIMARY_HOSTNAME`
For me
hostname : vservername.providername.tld
$PRIMARY_HOSTNAME : box.vservername.providername.tld
(notice the missing `box.`)
Munin needs that the hostname fits to the `/etc/hostname`.
* install the munin-node package
* don't install munin-plugins-extra (if the user wants it they can add it)
* expose the munin www directory via the management daemon so that it can handle authorization, rather than manintaining a separate password file