add support for cors-allowed-origins

[etwillbefine]

closes #2045

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[etwillbefine]

/assign @geojaz @rifelpet

[etwillbefine]

test CLA

[rifelpet]

/ok-to-test

[johngmyers]

Suggested change

	// CorsAllowedOrigins enables CORS for comma separated value
	CorsAllowedOrigins string `json:"corsAllowedOrigins,omitempty" flag:"cors-allowed-origins"`
	// CorsAllowedOrigins is a list of origins for CORS. An allowed origin can be a regular
	// expression to support subdomain matching. If this list is empty CORS will not be enabled.
	CorsAllowedOrigins []string `json:"corsAllowedOrigins,omitempty" flag:"cors-allowed-origins"`

[etwillbefine]

Just want to make sure: Because the k8s API Server accepts a stringSlice this can also be a list and will be automatically converted? According to API CLI args it needs to be comma separated

List of allowed origins for CORS, comma separated

[johngmyers]

It can be one flag with commas or it can be multiple flags.

[johngmyers]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: etwillbefine, johngmyers

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