extensions: Drop kata-containers for now

[cgwalters]

Until a new version is built.

[openshift-ci]

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[darkmuggle]

Before merging do we have an ETA on when #597 might be cleared by the Kata folks?

[cgwalters]

There's a build going now, if that succeeds let's close this.

But it will also be useful to see if this PR hits any further CI issues past that, so let's keep it open.

[openshift-ci]

@cgwalters: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Rerun command
ci/prow/build-test-qemu	0a19fa6	link	/test build-test-qemu

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[cgwalters]

 kola -p qemu-unpriv --output-dir tmp/kola run --qemu-nvme=true basic
2021-07-28T18:28:57Z kola: yaml: unmarshal errors:
  line 10: cannot unmarshal !!seq into string 

Ooh! Yep a new CI failure. I bet this is from https://github.com/openshift/os/pull/595/files

[fidencio]

There's a build going now, if that succeeds let's close this.

The new build succeeded, by the way. Thanks for the raising this to our attention and, as mentioned on #597, sorry for the breakage.

[miabbott]

 kola -p qemu-unpriv --output-dir tmp/kola run --qemu-nvme=true basic
2021-07-28T18:28:57Z kola: yaml: unmarshal errors:
  line 10: cannot unmarshal !!seq into string 

Ooh! Yep a new CI failure. I bet this is from https://github.com/openshift/os/pull/595/files

That's frustrating; I strongly believe I tested that change locally with cosa:latest...but anyways #599

[cgwalters]

Yep buildextend-extensions works here now.