Removing prestop hook for node-driver-registrar

[tsunny]

Is this a bug fix or adding new feature?
Bug

What is this PR about? / Why do we need it?
See issue: #747

What testing is done?
Valid template

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[coveralls]

Pull Request Test Coverage Report for Build 1674

• 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 81.712%

---

Totals
Change from base Build 1668:	0.0%
Covered Lines:	1747
Relevant Lines:	2138

---

💛 - Coveralls

[wongma7]

/lgtm
/approve
/ok-to-test
ty

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tsunny, wongma7

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[tsunny]

/retest

[AndyXiangLi]

Test is failing because go.sum not up-to-date, #777 should fix the test issue

[ayberk]

/retest