GrpcStubClient takes is_local
GrpcStubClient takes is_local

Summary:
This is in an effort to make the udid be needless in a stub client.

Doing so will allow for "direct clients" that are just a stub

Reviewed By: c-ryan747

Differential Revision: D19446491

fbshipit-source-id: 007f5d9ccd32c4441e2e2020207859ffad8dd88e

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