Fixes geerlingguy#97, Mentions geerlingguy#98, Still makes me sade: F…

…ix Docker 18.09.0 startup issue.

Merge pull request geerlingguy#80 from gebn/issue-79

Remove docker_restart_on_package_change option to correct warning; fixes geerlingguy#79

Merge pull request geerlingguy#71 from yankcrime/groups_fix

Update user's supplementary group membership, not primary group

Merge branch 'ubuntu-1804'

Fixes geerlingguy#42: Allow control over docker_service state.

Merge pull request geerlingguy#61 from coaxial/fix-warning

Fix 'using tests as filters' deprecation warning

PR geerlingguy#26 follow-up: Docs tidy.

PR geerlingguy#43 follow-up: Align order of vars in docs with defaults.

Docker repo doesn't yet support Ubuntu 18.04 Bionic, it seems.

Merge pull request geerlingguy#16 from digmore/armhf-support

Open up support for armhf architecture