Builds can be run in parallel
Builds can be run in parallel

We believe that since they are all run in separate containers, they
should be safe to run in parallel.

[#168085969](https://www.pivotaltracker.com/story/show/168085969)

Co-authored-by: Steve Taylor <2618d8eeb38db5666975df4fd945cc4512e3f384@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli