refactor pkg/zfs/mount.go Remove MountInfo struct from api

[codegagan]

Pull Request template

Please, go through these steps before you submit a PR.

Why is this PR required? What issue does it fix?: Fixes #142

What this PR does?: refactors the code to move MountInfo struct from api files

Does this PR require any upgrade changes?: No

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

Any additional information for your reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• Fixes remove MountInfo struct from the API file #142
• 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/openebs-docs is used to track them:

[codecov-io]

Codecov Report

Merging #225 into master will not change coverage.
The diff coverage is 33.33%.

@@          Coverage Diff           @@
##           master    #225   +/-   ##
======================================
  Coverage    8.50%   8.50%           
======================================
  Files          20      20           
  Lines        1046    1046           
======================================
  Hits           89      89           
  Misses        956     956           
  Partials        1       1           

Impacted Files	Coverage Δ
pkg/driver/agent.go	0.00% <0.00%> (ø)
pkg/usage/ping.go	41.66% <100.00%> (ø)

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[codegagan]

@pawanpraka1 Request you to review.

[pawanpraka1]

Thanks for this PR @codegagan. Changes are fine. I have given few minor comments.

[codegagan]

@pawanpraka1 have implemented the suggestions. Also, if you considering this PR for merge, please add label hacktoberfest-accepted.

[pawanpraka1]

looks good.

[pawanpraka1]

Thank you @codegagan for working on this PR.

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