Rename privet related helpers

BUG=brillo:1214
TEST='test_that -b $BOARD $DEV_HOST e:buffet_.*'

Change-Id: I8c36dabc8bdc9591f50117631b83c2bf339f29da
Reviewed-on: https://chromium-review.googlesource.com/278360
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
6 files changed