add image pull secrets in helm chart

[boddumanohar]

add image pull secrets in helm chart

What type of PR is this?
/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes: #165

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

add image pull secrets in helm chart

[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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[coveralls]

Pull Request Test Coverage Report for Build 784543432

• 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%

---

Totals
Change from base Build 781838976:	0.0%
Covered Lines:	551
Relevant Lines:	682

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💛 - Coveralls

[andyzhangx]

/ok-to-test
could you also add sth to charts\README.md? thanks.

[andyzhangx]

latest chart config has changed, pls run "helm package charts/latest/csi-driver-nfs -d charts/latest/" to update tgz file
Error: Process completed with exit code 2.

[andyzhangx]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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