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Changed variables such that the upstream rpc-repo is no longer used as a source of truth for installing pip. While the repo is still present as a default pip index (and it should remain to be as long as RAX is maintaining the repo) it is now only used with the scope of the repo server. Change-Id: I524919dc9b7ea0f69ae00227969a6421bd64ec3b Implements: blueprint remove-upstream-repo-dependency