Lukas found an issue with the latest maven 3.3.1 running the project:
https://jira.codehaus.org/browse/MNG-5787
(thank Jirka for finding that)
It seems the solution is either:
to downgrade to maven 3.2.5 or upgrade the frontend-maven-plugin to 0.0.23 when using maven 3.3.1 (which I am)
Sooo it begs the question, “What version of Maven are we supporting?"
https://github.com/hawkular/hawkular/pull/70