Add information about stemcell used in tests
Add information about stemcell used in tests

[#145915387]

Signed-off-by: Diego Lemos <48d75b1e8d05d722a97d5c3ce49024e6a466bebe@pivotal.io>

pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release