freeradius: Allow configurable client list

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
freeradius: Drop radius.conf

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
ntp: Allow limiting interfaces

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
networking: Add dhcpd6 support

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
networking: Add dhcp6 relay support

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
nagios: Fix check_tftpd

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>