Merge branch 'certbot' into 'master'

Add /etc/letsencrypt/archive to ssl_key abstraction

See merge request !283

Acked-by: Christian Boltz <apparmor@cboltz.de> for 2.10..master
2 jobs from master in 10 minutes and 2 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #127997411
build-all

00:02:36

 
  Test
passed #127997418
test-all

00:07:26