add ubuntu 1804 as supported OS

Now all puppet modules used in acceptance tests looks to support ubuntu 18.04

added improvement label

changed milestone to %2.1.0

created merge request !66 (merged) to address this issue

mentioned in merge request !66 (merged)

changed milestone to %2.2.0

changed milestone to %not-yet-planed-release

closed via merge request !66 (merged)

mentioned in commit 069b7488

changed milestone to %3.0.0