[Merge] ~sdeziel/ubuntu/+source/secureboot-db:not-in-containers into ubuntu/+source/secureboot-db:ubuntu/devel

[Simon Déziel]

@bryce, thanks for the nudge. Please take another look now that I've rebased the changes and included the detection of for live cd env.
-- 
https://code.launchpad.net/~sdeziel/ubuntu/+source/secureboot-db/+git/secureboot-db/+merge/454748
Your team Ubuntu Sponsors is requested to review the proposed merge of ~sdeziel/ubuntu/+source/secureboot-db:not-in-containers into ubuntu/+source/secureboot-db:ubuntu/devel.