Hugo Lefeuvre authored Jul 16, 2018 and Philippe Gorley committed Jul 16, 2018

ID field of os-release is much easier/safer to parse.

In order to stay compatible with scripts calling make-ring, we
convert --distribution args to lower case. This will ensure a smooth
transition (only Arch Linux scripts might break, sorry for that).

Also, add support for Linux Mint and Raspbian, both use apt and have
an important enough user base to be supported.

Change-Id: I13bf44b741a983656dab512ca95e89255efbd30d
Gitlab:#452


Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>