test: Normalize share name to not include capital letters

[kassarl]

What type of PR is this?

/kind bug
What this PR does / why we need it:
All letters in share names must be lower case, which was causing some tests to fail when they were generated with capital letters.

Which issue(s) this PR fixes:

Fixes #600

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

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[k8s-ci-robot]

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[andyzhangx]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, kassarl

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