fix(node): handle properly volume resize when asking for more than the available space

[plaffitt]

Pull Request template

Why is this PR required? What issue does it fix?: closes #649

What this PR does?: It reverts (ref)quota to the previous value of (ref)reservation (the value that we read from zfs before setting those 2 properties together).

Does this PR require any upgrade changes?: Not sure about what this question mean, but I don't think so.

If the changes in this PR are manually verified, list down the scenarios covered::

• Expand a PVC to an acceptable size and check that it worked as before
• Expand a PVC to an unreasonable size and check that it reverts to the original size while returning a grpc ResourceExhausted code

Any additional information for your reviewer? :
N/A

Checklist:

• Fixes REFQUOTA is updated even when volume expansion fails due to insufficient space #649
• PR Title follows the convention of <type>(<scope>): <subject>
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue on https://github.com/openebs/website is used to track them:

[Abhinandan-Purkait]

Thanks! Changes look reasonable to me. Can you please add a CI test for the same if possible?

Does this PR require any upgrade changes?:
Not sure about what this question mean, but I don't think so.

It basically means do we need to handle anything for upgrading from an older version to this.
Anyway the changes don't seem to directly impact upgrades but I will double check the scenarios you have mentioned, on a volume created on a previous version and the the resize being performed after upgrade.

[Abhinandan-Purkait]

@plaffitt I see you have created a new issue on the same, and your suggestion on adding a check on the ControllerExpand. That sounds fair to me, can you add the same in the PR. I tried the same and you can refer the code from below if it looks good to you. Thanks.

https://github.com/openebs/zfs-localpv/compare/add_check_controller?expand=1 cc @tiagolobocastro

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All modified and coverable lines are covered by tests ✅

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@@             Coverage Diff             @@
##           develop     #656      +/-   ##
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- Coverage    95.99%   95.94%   -0.06%     
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  Files            1        1              
  Lines          574      690     +116     
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+ Hits           551      662     +111     
- Misses          19       23       +4     
- Partials         4        5       +1     

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[plaffitt]

Hello, is there anything missing to review/merge this PR?