removed harcoded NAMESPACE from helm chart

[alexandrst88]

Is this a bug fix or adding new feature?
Override hardcoded kube-system namespace

What is this PR about? / Why do we need it?
Ability to run helm chart in another namespace, for example kube-system could be free out of any mutation or validation webhooks.

Should address #621
What testing is done?
Deployed in example namespace without issues.

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[coveralls]

Pull Request Test Coverage Report for Build 1653

• 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 1651:	0.0%
Covered Lines:	1747
Relevant Lines:	2138

---

💛 - Coveralls

[wongma7]

I have read a lot of conflicting info about what the best practice is.

Removing kube-system hardcode seems correct to me though.

helm/helm#5465 (comment)

@ayberk

[wongma7]

/ok-to-test

[ayberk]

/approve

Looks like this'll break installing via helm template | kubectl create --namespace foo -f -[1]. We're not advertising installing that way anywhere, so I think it should be fine.

Thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexandrst88, ayberk

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[ayberk]

/lgtm