Sets the imagePullSecrets if the value is set in the chart

[mtougeron]

Is this a bug fix or adding new feature?
Fixes #613

What is this PR about? / Why do we need it?
Sets the imagePullSecrets if the value is set in the chart

What testing is done?
Rendered the chart with & without imagePullSecrets set and validated the yaml with kubeval

[k8s-ci-robot]

Hi @mtougeron. Thanks for your PR.

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[coveralls]

Pull Request Test Coverage Report for Build 1620

• 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 81.656%

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Totals
Change from base Build 1618:	0.0%
Covered Lines:	1736
Relevant Lines:	2126

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💛 - Coveralls

[ayberk]

/ok-to-test

[ayberk]

/approve
/lgtm

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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