buffet: Serialize longs as strings.

As per Apiary recommendations.

BUG=chromium:434767
TEST=cros_workon_make --test buffet

Change-Id: I1df2a767f1a783ebd64c03f74d2992767c54f708
Reviewed-on: https://chromium-review.googlesource.com/231332
Tested-by: Anton Muhin <antonm@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
1 file changed
tree: 41b3750a61677f7fcd2f6e5dd8c3df32c25b53d6
  1. buffet/