REGTEST: add a test for connections to a "dispatch" address

The test includes both TCP and HTTP modes.

reg-tests/connection/h00001.vtc

@@ -0,0 +1,42 @@
+varnishtest "Validate proper operation of the 'dispatch' mode"
+feature ignore_unknown_macro
+
+server s1 {
+    rxreq
+    txresp
+} -start
+
+server s2 {
+    rxreq
+    txresp
+} -start
+
+haproxy h1 -conf {
+defaults
+    log global
+    timeout connect 1s
+    timeout client 1s
+    timeout server 1s
+
+listen fe_tcp
+    bind "fd@${fe_tcp}"
+    mode tcp
+    dispatch ${s1_addr}:${s1_port}
+
+listen fe_http
+    bind "fd@${fe_http}"
+    mode http
+    dispatch ${s2_addr}:${s2_port}
+} -start
+
+client c1 -connect ${h1_fe_tcp_sock} {
+    txreq -url "/"
+    rxresp
+    expect resp.status == 200
+} -run
+
+client c2 -connect ${h1_fe_http_sock} {
+    txreq -url "/"
+    rxresp
+    expect resp.status == 200
+} -run