Revert "REGTEST: Enable reg tests with HEAD HTTP method usage."

This reverts commit 47e4e13c01.

It's a temporary revert. This commit suggested to update to vtest
commit 4e43cc1 to fix handling of HEAD requests, but the compression
was broken two commits before, leaving us with no single version of
vtest being able to run all tests anymore.

Let's temporary disable HEAD again in the tests so that we can use
any version up to and including a2e82a8 for the time it takes vtest
to fix the compression.

reg-tests/http-messaging/h00000.vtc

@@ -25,7 +25,7 @@ server s1 {
 	txresp \
 	  -status 200 \
 	  -body "response 4"
-} -repeat 3 -start
+} -repeat 2 -start
 
 haproxy h1 -conf {
     defaults
@@ -87,47 +87,47 @@ client c1h1 -connect ${h1_feh1_sock} {
 # HEAD requests
 # Note: for now they fail with varnishtest, which expects the amount of
 # data advertised in the content-length response.
-client c2h1 -connect ${h1_feh1_sock} {
-	# first request is valid
-	txreq \
-	  -req "HEAD" \
-	  -url "/test11.html"
-	rxresp
-	expect resp.status == 200
-
-	# second request is valid and advertises C-L:0
-	txreq \
-	  -req "HEAD" \
-	  -url "/test12.html" \
-          -hdr "content-length: 0"
-	rxresp
-	expect resp.status == 200
-
-	# third request sends a body with a GET
-	txreq \
-	  -req "GET" \
-	  -url "/test13.html" \
-          -body "this must be delivered, like it or not"
-	rxresp
-	expect resp.status == 200
-
-	# fourth request is valid and advertises C-L:0, and close, and is
-	# followed by a string "this is not sent\r\n\r\n" which must be
-	# dropped.
-	txreq \
-	  -req "HEAD" \
-	  -url "/test14.html" \
-          -hdr "content-length: 0" \
-          -hdr "connection: close"
-	# "this is not sent"
-	sendhex "74787973207973206E6F742073656E740D0A0D0A"
-	rxresp
-	expect resp.status == 200
-
-	# the connection is expected to be closed and no more response must
-	# arrive here.
-	expect_close
-} -run
+#client c2h1 -connect ${h1_feh1_sock} {
+#	# first request is valid
+#	txreq \
+#	  -req "HEAD" \
+#	  -url "/test11.html"
+#	rxresp
+#	expect resp.status == 200
+#
+#	# second request is valid and advertises C-L:0
+#	txreq \
+#	  -req "HEAD" \
+#	  -url "/test12.html" \
+#          -hdr "content-length: 0"
+#	rxresp
+#	expect resp.status == 200
+#
+#	# third request sends a body with a GET
+#	txreq \
+#	  -req "GET" \
+#	  -url "/test13.html" \
+#          -body "this must be delivered, like it or not"
+#	rxresp
+#	expect resp.status == 200
+#
+#	# fourth request is valid and advertises C-L:0, and close, and is
+#	# followed by a string "this is not sent\r\n\r\n" which must be
+#	# dropped.
+#	txreq \
+#	  -req "HEAD" \
+#	  -url "/test14.html" \
+#          -hdr "content-length: 0" \
+#          -hdr "connection: close"
+#	# "this is not sent"
+#	sendhex "74787973207973206E6F742073656E740D0A0D0A"
+#	rxresp
+#	expect resp.status == 200
+#
+#	# the connection is expected to be closed and no more response must
+#	# arrive here.
+#	expect_close
+#} -run
 
 client c1h1 -connect ${h1_feh1_sock} {
 	# first request is valid