NEO: add support for cksumvfs

This is a follow-up of 7a1ba8df.
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passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

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failed SlapOS.SoftwareReleases.IntegrationTest-Master

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passed SlapOS.Theia.ResilienceTest-Master-ERP5

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

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