Align kind + k8 versioning

[alexmasi]

Use v0.26.6 kindest/node which is compatible with v0.20.0 of kind: https://github.com/kubernetes-sigs/kind/releases/tag/v0.20.0

Pin kind version in provisioner scripts

[github-actions]

Pull Request Test Coverage Report for Build 5407345298

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 66.061%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
deploy/deploy.go	0	1	0.0%

Totals
Change from base Build 5340408892:	0.0%
Covered Lines:	3673
Relevant Lines:	5560

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💛 - Coveralls

[alexmasi]

Will move presubmit to v0.20.0 in a follow up PR

[alexmasi]

/gcbrun

[alexmasi]

/gcbrun

[alexmasi]

/gcbrun

[alexmasi]

/gcbrun

[alexmasi]

Having some issues with kind 20. Changing this PR to do the following:

• pin the kind version to 19 in the image provisioner scripts
• use kindest/node 0.26.0 in all deployment configs
• use k8 0.26 in all code dependencies
• use k8 0.27 for the client (kubectl)
• require at least kind 17 in all deployment configs, however 19 is the latest version known to work

This combination is known to work with KNE for all supported vendor images.