testing/kubernetes: tweak env variables

Follow up on alpine/aports@5c94d4af

Changes:

* Revert s/KUBELET_KUBEADM_ARGS/KUBELET_ARGS
* Use /var/lib/kubernetes as the placeholder for other control planes env files
7 jobs for !10546 with tweak-k8s in 8 minutes and 29 seconds (queued for 1 second)
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x86_64 docker-alpine allowed to fail
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aarch64 ci-build docker-alpine
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armv7 ci-build docker-alpine
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ppc64le ci-build docker-alpine
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s390x ci-build docker-alpine
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x86 ci-build docker-alpine
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x86_64 ci-build docker-alpine
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