REGTESTS: fix the race conditions in secure_memcmp.vtc

In the same way than for normalize_uri.vtc, a "Connection: close" header is
added to all responses to avoid any connection reuse. This should avoid any
"HTTP header incomplete" errors.

(cherry picked from commit 0dc70ab799f55f044f976b325f64f8ac246585e2)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit fd9ff1f80bd39a3c91036d05973a29d5e9ab8d76)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/reg-tests/converter/secure_memcmp.vtc b/reg-tests/converter/secure_memcmp.vtc
index b16e021..54303a8 100644
--- a/reg-tests/converter/secure_memcmp.vtc
+++ b/reg-tests/converter/secure_memcmp.vtc
@@ -7,12 +7,12 @@
 
 server s1 {
 	rxreq
-	txresp
+	txresp -hdr "Connection: close"
 } -repeat 4 -start
 
 server s2 {
 	rxreq
-	txresp
+	txresp -hdr "Connection: close"
 } -repeat 7 -start
 
 haproxy h1 -conf {