switch cf-acceptance-tests to release-candidate
switch cf-acceptance-tests to release-candidate

- this now matches cf-deployment, which is also on release-candidate

Signed-off-by: Clay Kauzlaric <b161dd152ba17987305414195d30c2af856d229f@pivotal.io>

cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release