[manila-csi-plugin] support muilple share rules

[moonek]

What this PR does / why we need it:

Support muilple share rules.

Which issue this PR fixes(if applicable):
fixes #2725

Special notes for reviewers:

As I don't have a cephfs environment, I can't verify this PR.

Release note:

[manila-csi-plugin] support muilple share rules

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @moonek. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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