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This creates a second pty for pty_driver to open, to prevent the need for freezing the user pty. This also allows the user pty to fully log and print all output. BRANCH=None BUG=b:74023102,b:73310923 TEST=servod is fast now, recovery works CQ-DEPEND=CL:958127 Change-Id: Ib369a5e64838ded98719d76f8159d71a97fe08ad Signed-off-by: Nick Sanders <nsanders@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/958128 Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>