Revert of Require internal recipe tryjob (patchset #1 id:1 of https://codereview.chromium.org/2187493005/ )
Revert of Require internal recipe tryjob (patchset #1 id:1 of https://codereview.chromium.org/2187493005/ )

Reason for revert:
Waiting until can land all 3 next week.

Original issue's description:
> Require internal recipe tryjob
>
> BUG=628801
>
> Committed: https://github.com/luci/recipes-py/commit/87823726a3c8ef0016780ac1b752a758f2191a55

TBR=nodir@chromium.org,estaab@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=628801

Review-Url: https://codereview.chromium.org/2246653002

luci/recipes-py,luci/recipes-py