REGEST: Add reg tests about error files

2 reg tests are added. The first one ensures the declaration of errors in a
proxy is fonctionnal. It declares http-errors sections and declare error files
using the errorfile and the errorfiles directives, both in the default section
and the frontend sections. The second one ensures it is possible to use a custom
error file for an HTTP deny rule.
diff --git a/reg-tests/http-errorfiles/http_deny_errors.vtc b/reg-tests/http-errorfiles/http_deny_errors.vtc
new file mode 100644
index 0000000..53c4c42
--- /dev/null
+++ b/reg-tests/http-errorfiles/http_deny_errors.vtc
@@ -0,0 +1,57 @@
+varnishtest "Test the custom erorrs for HTTP deny rules"
+#REQUIRE_VERSION=2.2
+
+# This config tests the custom errors for HTTP deny rules.
+
+feature ignore_unknown_macro
+
+
+haproxy h1 -conf {
+    http-errors errors-1
+        errorfile 400  ${testdir}/errors/400-1.http
+        errorfile 403  ${testdir}/errors/403-1.http
+        errorfile 404  ${testdir}/errors/404-1.http
+        errorfile 500  /dev/null
+
+    defaults
+        mode http
+        timeout connect 1s
+        timeout client  1s
+        timeout server  1s
+
+    frontend fe1
+        bind "fd@${fe1}"
+        http-request deny deny_status 400 if { path /400 }
+        http-request deny deny_status 403 errorfile  ${testdir}/errors/403.http if { path /403 }
+        http-request deny deny_status 404 errorfiles errors-1 if { path /404 }
+        http-request deny deny_status 500 errorfile  /dev/null if { path /500-1 }
+        http-request deny deny_status 500 errorfiles errors-1 if { path /500-2 }
+
+} -start
+
+client c1r1  -connect ${h1_fe1_sock} {
+        txreq -req GET -url /400
+        rxresp
+        expect resp.status == 400
+	expect resp.http.x-err-type == <undef>
+} -run
+client c1r2  -connect ${h1_fe1_sock} {
+        txreq -req GET -url /403
+        rxresp
+        expect resp.status == 403
+	expect resp.http.x-err-type == "default"
+} -run
+client c1r3  -connect ${h1_fe1_sock} {
+        txreq -req GET -url /404
+        rxresp
+        expect resp.status == 404
+	expect resp.http.x-err-type == "errors-1"
+} -run
+client c1r4  -connect ${h1_fe1_sock} {
+        txreq -req GET -url /500-1
+        expect_close
+} -run
+client c1r5  -connect ${h1_fe1_sock} {
+        txreq -req GET -url /500-2
+        expect_close
+} -run