Add flag for non-interactive service discovery

[jfroy]

Is your feature request related to a problem? Please describe.
The service discovery command requires user input to confirm. This makes it impossible to use as an init container in a kubernetes pod since there is no stdin or tty.

	fmt.Print("Would you like to add these services? [y/N] ")
	var response string
	fmt.Scanln(&response)

Describe the solution you'd like
Add a flag to bypass confirmation, or add tty detection to automatically skip it.