Warn users of migrating without draining

[partcyborg]

Warn users about migrating nodes without fully draining them of mounted
EBS volumes.

Is this a bug fix or adding new feature?

What is this PR about? / Why do we need it?

What testing is done?

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[k8s-ci-robot]

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[coveralls]

Pull Request Test Coverage Report for Build 1791

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.789%

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Totals
Change from base Build 1788:	0.0%
Covered Lines:	1756
Relevant Lines:	2147

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💛 - Coveralls

[wongma7]

/check-cla

/ok-to-test
/lgtm
/approve

thanks. Definitely need this warning. it seems the best official documentation on migration is still this blog post, but it's a bit dated by now https://kubernetes.io/blog/2019/12/09/kubernetes-1-17-feature-csi-migration-beta/

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: partcyborg, wongma7

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[partcyborg]

/check-cla