Add support for node existing service accounts

[marlenepereira]

Is this a bug fix or adding new feature?
New feature

What is this PR about? / Why do we need it?
Fixes #703

What testing is done?
Helm template

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[coveralls]

Pull Request Test Coverage Report for Build 1567

• 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 81.286%

---

Totals
Change from base Build 1562:	0.0%
Covered Lines:	1707
Relevant Lines:	2100

---

💛 - Coveralls

[ayberk]

/ok-to-test

[marlenepereira]

@ayberk Test failed for some reason, would you be able to retest?

[ayberk]

/retest

[ayberk]

Can we do create, name, annotations fields instead? Although I like the brevity, we should be consistent with the other two.

[marlenepereira]

I've updated to keep it consistent. Thanks

[ayberk]

/lgtm
/approve

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ayberk, mper0003

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