reusing existing deployment and service for creating tunnel

[chandanpasunoori]

this can useful if user just want use same service ip as it may have configured already in some other deployments/applications to use.

deleting and recreating service will change ip address for service which may not be desired for few users (for us).

[chandanpasunoori]

@omrikiei renamed to reuse and added some error handling if used without reuse flag when resources already exists with same name.