add avahi service
add iptables
add ip6tables service
removed ip6tables-openrc, renamed iptables-openrc to iptables
corrections for iptables, avahi-daemon & avahi-dnsconfd
added vsftpd
corrected PID path
Fixes indentation of several files (tabs -> spaces)

- avahi-daemon
- avahi-dnsconfd
- iptables
- vsftpd