scripts/install: add support for 'debug.d' folders

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: rework debugconfig service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
avahi: rework debugmode service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
avahi: add debugmode service config

Signed-off-by: Stephan Raue <stephan@openelec.tv>
avahi: rework debugmode service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
connman: rework debugmode service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xorg-server: rework debugmode service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: rework debugconfig service files

Signed-off-by: Stephan Raue <stephan@openelec.tv>
eventlircd: rework debugconfig service files

Signed-off-by: Stephan Raue <stephan@openelec.tv>
avahi: fix systemd service script

Signed-off-by: Stephan Raue <stephan@openelec.tv>
iptables: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>