gluon-autoupdater: remove dead code

Recently the autoupdater contained a case statement to distinguish
between TP-Link WDR3600 and TP-Link WDR4300. This was left over from
previous development versions of autoupdater that relied on the board
name instead of the model. It is thus no longer needed and be removed
safely.
gluon-autoupdater: improve manifest.sample

Makes manifest.sample use the model instead of the board name as that is
what the script actually expects. Also, a sample signature is added.
gluon-core: add sh file to get model name etc.
gluon-autoupdater: use the new get_model function
added gluon-alfred and gluon-alfred-ffmap
Clean up gluon-alfred

* Merge gluon-alfred-ffmap into gluon-alfred
* Use gluon-crond instead of alfred's "facter" mechanism based on the broken busybox crond
gluon-mesh-vpn-fastd: enable no_rebroadcast on the VPN interface
alfred: added more information to send, reformatted location

location is object with latitude and longitude
added:
* firmware
* autoupdater status
* hardware model
* primary mac address
* mesh IPv6 addresses