standalone_test: Expose JeOS download on test runner

If the JeOS image changed in the repos, we require the
latest one, therefore, this image has to be downloaded.
Since it will take some minutes, it will make people
nervously wonder what is going on.

It seems that my patch that prints a message for the
user to wait ends up being ignored, so, let's print
messages coming from the setup, which includes the
JeOS download progress bar. With the progress bar,
people will feel more reassured.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>