Fix for specified size of additional disks on Instance being ignored

[M-Schiefer]

Fix for #371

[google-cla]

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[google-oss-prow]

Hi @M-Schiefer. Thanks for your PR.

I'm waiting for a GoogleCloudPlatform 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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[akinfermo]

/ok-to-test

[akinfermo]

Hi @M-Schiefer , can you please sign the CLA https://cla.developers.google.com/? It's necessary for us to merge your contribution.

[M-Schiefer]

Hey @akinfermo, I fixed my CLA a while ago, but the operator-oss-presubmit failed.
Is there anything I still need to do here?

Thank you!

[akinfermo]

/retest

[akinfermo]

LGTM

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akinfermo, M-Schiefer

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