Molecule also needs to be bumped to support Ansible 2.10
lint: section changed in Molecule 3.x - adapted.
molecule-docker added do test-reqs because it code has moved to it from
molecule core
pytest-testinfra and pytest-molecule needed for testinfra tests to work

[1]: https://github.com/ansible-community/molecule/issues/2872

Change-Id: I0299f5126ebd080f3912a76294b0013abe7747a0