Now gerrit.changeScreen can be set in gerrit.config to select which
UI is presented: OLD_UI for the legacy view, and CHANGE_SCREEN2 for
the new UI. The current default is OLD_UI but this is expected to
change in the future before the old UI is deleted.
A per user preference can be used to switch the screen.
Started-by: David Ostrovsky <david@ostrovsky.org>
Change-Id: I340efe7ff264a534cb9a83609bbc63621e2b60c1
6d731f5c6d