Added default user for each provider in the etcd backup restore commands

[ndeksa]

Updated etcd back-restore commands to include:

• Default user for each supported provider
• su command

[eks-distro-bot]

Hi @ndeksa. Thanks for your PR.

I'm waiting for a aws member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[abhay-krishna]

/lgtm
/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhay-krishna

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