May potentially be leaking resources with envtest

[exdx]

I noticed several instances of the api-server and etcd running as processes on my host after running the unit test suite several times. This may potentially be a case where the envtest test resources are not being cleaned up properly?

[timflannagan]

I ran into this locally and it seems like we're definitely leaking processes when running make test-unit locally. I tried reproducing the unit test failure in #377 and wasn't able to reproduce until I had manually killed all the leaked processes.

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