v2.8.0

Notice:

• this release was marked as a pre-release after initial publish because a leaky credentials bug was exposed.
  A new release of CATs will be released once the bug is fixed.

New Tests

-v3/deployment.go

• Promote test out of capi-experimental into v3 -- validate zero downtime app deployments.

Updated Tests

-aps/lifecycle.go

• Provide better CATs failure message (the output of cf app) if test fails to match the metrics regex.