[Merge] ~rbalint/ubuntu-seeds/+git/platform:demote-devscripts-lintian into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:groovy

[Balint Reczey]

For now lintian and devscripts stay in main because there would be no easy way of monitoring the security problems if they were demoted, according to the Security Team.

This could be revisited later.
-- 
https://code.launchpad.net/~rbalint/ubuntu-seeds/+git/platform/+merge/391464
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~rbalint/ubuntu-seeds/+git/platform:demote-devscripts-lintian into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:groovy.