test-in-cluster broken by https://github.com/coreos/coreos-layering-examples/pull/20

[cgwalters]

I should have realized this earlier but basically coreos/layering-examples#20 broke test-in-cluster because:

• Suddenly we have multiple Dockerfile, not just one
• Most of the Dockerfile require a rhel.repo

So...two things too:

• While I think this test is definitely valuable, we'd get more immediate value out of running the openshift e2e tests; this is where openshift/os: Copy all cluster jobs from MCO release#29228 is leading
• But that said, I think we could fix this test relatively easily by changing it to use say https://github.com/coreos/coreos-layering-examples/blob/rhcos/selinux/Dockerfile and we need to change the script to do something like "detect if dockerfile is running rpm-ostree install" and if it isn't, don't inject a requirement on rhel.repo or just hack our test to make a dummy one

[cgwalters]

cc @cheesesashimi per our chat

[cheesesashimi]

Fixing the multiple Dockerfile issue should be straightforward: https://github.com/openshift/os/blob/master/tests/layering/build_helper_test.go#L106-L109.

[cgwalters]

coreos/layering-examples#26 will help with this.