Docker 0.4.1

Merges:
*  https://github.com/autotest/autotest-docker/pull/9
*  https://github.com/autotest/autotest-docker/pull/11
*  https://github.com/autotest/autotest-docker/pull/12
*  https://github.com/autotest/autotest-docker/pull/13
*  https://github.com/autotest/autotest-docker/pull/14