Use the test macros to automatically propagate some errors, and check
and log others while running the tests. This can help in debugging
exactly why a test has failed.
This is a bad header fold but since the popular browsers accept this
violation, so does curl now. Unless built with hyper.
Add test 1473 to verify and adjust test 2306.
Reported-by: junsik on github
Fixes#11605Closes#11607
