feat: testing improvements

- update: Testing as unprivileged user
- update: Molecule using variable defaults
- update: no more privileged container
- update: Skip steps in docker
- update: dependency handling removed
- update: firewall handling enhanced
- update: SELinux handling enhanced
- update: Review of the role(s)

- See also: while-true-do/ansible-skeleton#64

feat: parallel testing in travis

- update: .travis.yml
- update: molecule.yml
- update: README.md

feat: fedora 30 support

feat: redhat support, tags, idempotence test

fix: ansible lint

fix: blank lines