Actually load json when we claim to, instead of pyl.
Actually load json when we claim to, instead of pyl.

BUG=
TBR=iannucci@chromium.org

Review URL: https://codereview.chromium.org/1354433002 .

luci/recipes-py,shishkander/recipes-py,luci/recipes-py,shishkander/recipes-py