feat: add support for Kubernetes v1.18.10 on Azure Stack

[JesusAlvarezTorres]

Reason for Change:

Change adds support for Kubernetes v1.18.10 on Azure Stack

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• No
• Yes

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[JesusAlvarezTorres]

/assign @mboersma

[jadarsie]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jackfrancis]

@JesusAlvarezTorres if you rebase this on top of current master we should be able to re-run CI and get accurate Windows VHD signal

[JesusAlvarezTorres]

@JesusAlvarezTorres if you rebase this on top of current master we should be able to re-run CI and get accurate Windows VHD signal

thanks for the heads up @jackfrancis , rebased.

[JesusAlvarezTorres]

@jackfrancis FYI my build vhd pipeline failed, the problem seems to be the 1.18.8 images have been removed. That change is in #3948. I therefore need that PR to go first, then rebase, then this PR can be validated and go in.

[jackfrancis]

@JesusAlvarezTorres one more rebase and we can get this in :)

[JesusAlvarezTorres]

@JesusAlvarezTorres one more rebase and we can get this in :)

thanks @jackfrancis just pushed the rebase

[jackfrancis]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, JesusAlvarezTorres

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