REGTEST: Enable again reg tests with HEAD HTTP method usage.

These reg tests have been disabled because they required a version of vtest
including a bug fix supposed to make these ones work without breaking others.
But reg-tests for compression were broken.

This issue has been fixed by 525ef0f vtest commit. So, to make all the
reg tests work you must update your vtest program to include 525ef0f commit.
(see https://github.com/vtest/VTest/commit/525ef0f for more information.
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