New code to remove a container with CDDDocker

[cea2aj]

With edge devices typically having small storage capabilities, it would be useful to be able to remove a container from a device in order to save space.

A CDDDocker script would look like:
./remove.sh ${AWS_IOT_THING_NAME} 6b670c2e8cafcfb0546b4bcab6527cbaa2a8756ff94b7b449e846f0f1525f886

In DockerHelper.java, the function would look like:
Optional<String> removeContainer(String name);

In BasicDockerHelper.java, the key command would be:
dockerClient.removeContainerCmd(container.getId()).exec();