test: create a shared LV for use by two app pods

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Why is this PR required? What issue does it fix?: Adds a test for shared volume.

What this PR does?: Creates a LV by specifying shared parameter in the storage class so that the volume can be mounted to more than one path.

Does this PR require any upgrade changes?: No

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

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

Checklist:

[ ] Fixes #
[x] 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: