Improved pilight uuid generation

Previously, pilight generated the UUID by using the mac address of
(one of) the wired network adapters. Almost all mainboards have at
least of one such network adapters present, except the Raspberry
Pi model A. So we need a different method to generate a fixed
unique ID for all pilight instances.

This new code will use the Rasbperry Pi's serial number retrieved
from /proc/cpuinfo so we can also generate a UUID on model A
boards. It will also dynamically retrieve network adapters and use
one of them to build a UUID based on its mac address.
Fixed the arctech all function
More fixes in the rev protocol
Fixed bug in ssdp uuid generator
Fixed bug in which additional  protocol threads where started on each node reconnection
And another go to fix the rev protocol
Merge remote-tracking branch 'upstream/development' into development