only create namespace if it doesn't exist.

[matthewmcdaniel]

Allows users to specify existing namespace.

[coveralls]

Pull Request Test Coverage Report for Build 8622296540

Details

• 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 65.38%

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Totals
Change from base Build 8543875909:	0.0%
Covered Lines:	2253
Relevant Lines:	3446

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💛 - Coveralls

[Inbaraj-S]

LGTM, pending helm validation.