Refactored to make test more readable
Refactored to make test more readable

When a Process's struct ProcessState is nil, it means the process is
still running, which is a little counter intuitive and isn't obvious.
To make that a litlte more obvious to the reader, we move the
conditional into a descriptive boolean like isAlive.

cloudfoundry-incubator/cf-tcp-router,cloudfoundry-incubator/cf-tcp-router