gddo-server: send status to teeproxy

Previously, the godoc.org request status was not being sent to the
teeproxy. This is now fixed.

Change-Id: I90c33ee3fe0f75cbbff42b5d6b16b29bd3a1dd2d
Reviewed-on: https://go-review.googlesource.com/c/gddo/+/249961
Reviewed-by: Jonathan Amsterdam <jba@google.com>