Remove obsolete third argument check from ggp
Remove obsolete third argument check from ggp

This was used when transitioning to ZUUL_URL from the calling
environment, and is no longer required by any calls to the script.

Change-Id: Ie3e1740a6cc3d67bd306b5d6c258002d51eaffe8

open-switch/infra_puppet-jenkins,open-switch/infra_puppet-jenkins