automation: support and use Debian Buster by default...
automation: support and use Debian Buster by default
While Debian Buster (Debian 10) was released in July, the
AWS AMIs were not published until mid September.
This commit teaches the automation system to create AMIs for
Debian Buster. Since Debian Buster is the new stable Debian
release, we make it the default distribution for automation.
Differential Revision:
https://phab.mercurial-scm.org/D6917