projects: Add fedora-okd-builder container and ImageStream

[LorbusChris]

This PR adds a fedora-okd-builder Dockerfile and ImageStream to use as build environment for OKD-on-FCoS components on Prow.

Right now, the configured repository to push to is docker.io/openshift/fedora-okd-builder, which will have to be created, if we agree on the naming

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[smarterclayton]

I'm confused what this is for.

[smarterclayton]

The golang builder should be sufficient as is.

[LorbusChris]

I'd like to avoid using RPMs that weren't built on a Fedora system in FCoS, as I am unsure of the implications this might have.
(in order to stay as close to Fedora's packaging guidelines as possible, now that we are already not using Koji to run the builds for these RPMs)

[LorbusChris]

If this is not seen as a necessary precaution, I will go ahead and add CI jobs for RPM builds on the centos base.

[LorbusChris]

see also: openshift/enhancements#78 (comment)

[smarterclayton]

Ultimately these are being consumed from CI infra and available freely today - there may be specific places where we want to duplicate, or make it even easier for someone to recreate on their own, but I don't see a huge incentive to do that NOW vs at a point where we have to.

[vrutkovs]

This PR is certainly useful, but not right now. Rebuilding rpms with f30 would most likely require updates to specs - that might take quite a while to do correctly.

For now its fine to use centos builder for RPMs - all binaries are golang anyway, they seem to run fine on F30

[LorbusChris]

Alright then.
Putting this on
/hold

[openshift-ci-robot]

@LorbusChris: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/step-registry-shellcheck	d0adb3f	link	/test step-registry-shellcheck

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