The copyright and license notice is already in the LICENSE file. There
is no justifiable reason to also require that it be included in every
file, since the individual files are not individually distributed except
as part of the entire package.
This test was originally intended to guard against regressions for
commit 16b59cbc74.
As such, it only needs to ensure that process exit has not been held up
by the date cache timer, which would fire on the next second.
There was previously up to a second exit delay when exiting node
right after an http request/response, due to the utcDate() function
doing a setTimeout to update the cached date/time.
Fixing this should increase the performance of our http tests.