USHIFT-6492: Simplified topolvm storage configuration to use the microshift default

[sjug]

Improve the handling of default vg_name

[openshift-ci-robot]

@sjug: This pull request references USHIFT-6492 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.22.0" version, but no target version was set.

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In response to this:

Improve the handling of default vg_name

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[ggiguash]

/lgtm
/verified by @sjug

[openshift-ci-robot]

@ggiguash: This PR has been marked as verified by @sjug.

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In response to this:

/lgtm
/verified by @sjug

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, sjug

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[openshift-ci]

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