✨Add support for multiple block device mappings

[alexander-demicev]

What this PR does / why we need it:
In order to avoid having the main root partition to be fulled out by logs or empty dir pods data or docker images, user can prefer to have a dedicated partition for each. This PR adds support for creating multiple block device mappings.
Happy to hear what others think about this change.

[k8s-ci-robot]

Hi @alexander-demichev. Thanks for your PR.

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[randomvariable]

/ok-to-test

[randomvariable]

/lgtm
/assign @rudoi for approval

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In response to this:

/lgtm
/assign @rudoi for approval

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[rudoi]

/approve

thanks for this!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rudoi

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