[autotest] Non-interactive mode for setup_dev_autotest

site_utils/setup_dev_autotest.sh asks for user input in the middle
of the process. This commit adds a non-interactive mode that skipps
all the questions.

BUG=None
TEST=Tested manually with database previously existing/not existing,
shadow_config.ini previously existing and different options.

Change-Id: I4df2da9058f7b7708d545fd939e217c86b6ab8a4
Reviewed-on: https://chromium-review.googlesource.com/217498
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Jakob Jülich <jakobjuelich@chromium.org>
Commit-Queue: Jakob Jülich <jakobjuelich@chromium.org>
1 file changed