Add aiccu service as provided by OpenWRT with support for uci

Source: http://wiki.openwrt.org/doc/uci/aiccu
Add a hotplug script in order to reconnect when wan is back
Prevent aiccu from running multiple instances

aiccu doesn't stop when running 'aiccu stop' so, kill everything in order
to limit the amount of processes running.
Add log messages when running hotplug actions
Update copyright information on init.d/aiccu