[autotest] Add verbose option to  autotest setup script

Sometimes I have permission errors during when running
build_externals.py and compile_gwt_clients.py -a, but
they were suppressed and so errors were not reported
to stderr. This change adds an option -v so user running
script can see those errors.

BUG=None
TEST=ran setup_dev_autotest.sh
Change-Id: I6e0fda5325fec5ab8ff383ce00d174ea2f265730
Reviewed-on: https://chromium-review.googlesource.com/207474
Reviewed-by: Dan Shi <dshi@chromium.org>
Tested-by: Michael Liang <michaelliang@chromium.org>
Commit-Queue: Michael Liang <michaelliang@chromium.org>
Reviewed-by: Michael Liang <michaelliang@chromium.org>
1 file changed