fix volume size mismatch between driver and PV

[Jiawei0227]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Fix the issue where csi provisioner does not honor the volume size returned from CreateVolumeResponse.

Which issue(s) this PR fixes:

Fixes # #199

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fix an issue where the csi-provisioner does not honor the volume size returned from CreateVolumeResponse. Stop rounding up bytes returned from CreateVolume.

/cc @msau42
/cc @wongma7

[k8s-ci-robot]

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Note that only kubernetes-csi members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to this:

What type of PR is this?
/kind bug

What this PR does / why we need it:
Fix the issue where csi provisioner does not honor the volume size returned from CreateVolumeResponse.

Which issue(s) this PR fixes:

Fixes # #199

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fix an issue where the csi-provisioner does not honor the volume size returned from CreateVolumeResponse.

/cc @msau42
/cc @wongma7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[msau42]

/lgtm
/approve

For the release note, maybe make it more descriptive like "Stop rounding bytes returned from CreateVolume"

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jiawei0227, msau42

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[Jiawei0227]

/retest