Remove the obsolete firewall configuration as the legacy firewall
package was removed in a901329781.

And at the same time, define in the configuration the correct paths
for the firewall rules, installed as /etc/chilli/{up|down}.sh

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>

UCI commands report errors in parsing coova-chilli
sample configuration file. Fix this issue by using
proper format in configuration.

Signed-off-by: Rajan Vaja <rajan.vaja@gmail.com>

fix #1221

Signed-off-by: Jaehoon You <teslamint@gmail.com>