[autotest] Allow remote access for shard DB

Sentinel service needs to access shards' DB remotely.
Change the semantics of -m option of setup_dev_autotest.sh.

BUG=chromium:497259
TEST=

Change-Id: I273e264b0e605c27ba17fc9c11aeb8d1ad9ac05b
Reviewed-on: https://chromium-review.googlesource.com/296070
Commit-Ready: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Dan Shi <dshi@chromium.org>
1 file changed