Update comment about inspecting source

A couple of procs had been merged into a singple proc and the comment didn't reflect that.
Remove superfluous certificate authority checks

They didn't really provide anything and they might royally screw things up in about 13 months when our certificate expires.
Don't run rpi-update as part of the full update.
Make parse_mac_address_from_line work properly.
Get mac address from wlan0 or whatever, if no eth0
Use log_locally to report an alternet mac address

Using logger at that point causes an infinite recursion.
Cache the mac address once it is determined.
Log the full version, like 1.17-2, with login

...along with the previous one that's just like 1.17
Include full version in login message.
Log full version even if not installed from package
Version bump to 1.18-1.
Reload adept config on update request

...in case piaware-config has been run and used to change something since piaware last started.
Comments and bug fix to is_piaware_running
Version bump to 1.18-2
Disconnect after many unrecognized server messages
Report full version when running piaware -v.