post_gerrit_comment.sh: Enable posting comments to Gerrit by default

At the same time, don't post comments when run on staging (unless it's
a sandbox project used for testing this script).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Iab53913dd4af7206cc08db5bf35ba9906db52d56
1 file changed