beatrix: update ruby test plugins

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
beatrix: copy test artifacts using a unique name

This is to avoid having older versions around.

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
payment: fix typo in DirectPaymentProcessor

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>