authpolicy: Add ERROR_OU_CONSTRAINT_VIOLATION

The error is use to improve the error message in Chrome when an
unprivileged user tries to join a device with a machine name that
already exists elsewhere.

BUG=chromium:864997
TEST=Tested on device

Change-Id: I6c407cd04fb60712b00f2653d12f204c4758982b
Reviewed-on: https://chromium-review.googlesource.com/1141955
Commit-Ready: Lutz Justen <ljusten@chromium.org>
Tested-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Roman Sorokin <rsorokin@chromium.org>
1 file changed