REGTEST: Enable reg tests with HEAD HTTP method usage.

This patch enables the part of this reg test which could not work due to a vtest
(formerly varnishtest) bug.

NOTE: You must have a vtest version with 4e43cc1 commit for this bug fix to make this
script succeed (see https://github.com/vtest/VTest/commit/4e43cc1fec45213b64503812599847c02045c8fa
for more information).
1 file changed