Renames BUILDBOT_HOST to BUILDBOT_ADDR.

Signed-off-by: Markus Hubig <mhubig@gmail.com>
Adds the upgrade-slave command.

Signed-off-by: Markus Hubig <mhubig@gmail.com>
Removes the volume.

Signed-off-by: Markus Hubig <mhubig@gmail.com>