[autotest] Disable server-side packaging for builds older than 6919.

The server-side packaging code is required to be ready for test to run with ssp.
Builds older than 6919 does not satisfy with that requirement.

BUG=chromium:453624
TEST=local autoserv run against older build, confirm the warning message
presents and the test does not run with ssp.

Change-Id: I16c562e77cec3c734f4c5ba6a4b7e047304745ad
Reviewed-on: https://chromium-review.googlesource.com/263170
Reviewed-by: Simran Basi <sbasi@chromium.org>
Reviewed-by: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
Trybot-Ready: Dan Shi <dshi@chromium.org>
1 file changed