Add K8s external storage E2E tests

[boddumanohar]

What type of PR is this?
/kind flake

What this PR does / why we need it:
Adding External e2e tests. Offers a better way to test the driver changes.

Which issue(s) this PR fixes:

Fixes

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

[k8s-ci-robot]

Hi @boddumanohar. Thanks for your PR.

I'm waiting for a kubernetes-csi 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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[andyzhangx]

that's duplicated, can we use yaml files in deploy folder?

[coveralls]

Pull Request Test Coverage Report for Build 795460410

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 80.792%

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Totals
Change from base Build 789074734:	0.0%
Covered Lines:	551
Relevant Lines:	682

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💛 - Coveralls

[andyzhangx]

/ok-to-test
what's the test result?

[andyzhangx]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [andyzhangx]

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