MINOR: reg-tests: test http-reuse with proxy protocol

Complete the http-reuse test with the proxy protocol usage. A server
connection can be reused if the proxy protocol fields are the same.
diff --git a/reg-tests/connection/http_reuse_conn_hash.vtc b/reg-tests/connection/http_reuse_conn_hash.vtc
index e0adefc..e60ed05 100644
--- a/reg-tests/connection/http_reuse_conn_hash.vtc
+++ b/reg-tests/connection/http_reuse_conn_hash.vtc
@@ -19,8 +19,16 @@
 		http-request set-dst-port hdr(x-dst-port)
 		server srv2 ${h1_feR_dst1_addr}:0 pool-low-conn 2
 
+	# proxy protocol
+	# must use reuse always as consecutive requests are from different client
+	listen sender-proxy
+		bind "fd@${feS_proxy}" accept-proxy
+		http-reuse always
+		server srv2 ${h1_feR_proxy_addr}:${h1_feR_proxy_port} send-proxy
+
 	listen receiver
 		bind "fd@${feR_ssl}" ssl crt ${testdir}/common.pem
+		bind "fd@${feR_proxy}" accept-proxy
 		http-request return status 200
 		http-after-response set-header http_first_request %[http_first_req]
 
@@ -99,3 +107,45 @@
 	expect resp.http.x-dst == "dst2"
 	expect resp.http.http_first_request == "0"
 } -run
+
+## first request with proxy protocol
+client c_proxy -connect ${h1_feS_proxy_sock} -proxy1 "127.0.0.1:40000 ${h1_feS_proxy_addr}:${h1_feS_proxy_port}" {
+	txreq
+	rxresp
+	expect resp.status == 200
+	expect resp.http.http_first_request == "1"
+
+	txreq
+	rxresp
+	expect resp.status == 200
+	expect resp.http.http_first_request == "0"
+} -run
+
+## second request with same proxy protocol entry
+client c_proxy -connect ${h1_feS_proxy_sock} -proxy1 "127.0.0.1:40000 ${h1_feS_proxy_addr}:${h1_feS_proxy_port}" {
+	txreq
+	rxresp
+	expect resp.status == 200
+	expect resp.http.http_first_request == "0"
+} -run
+
+## third request with different proxy protocol entry, no reuse
+client c_proxy -connect ${h1_feS_proxy_sock} -proxy1 "127.0.0.1:50000 ${h1_feS_proxy_addr}:${h1_feS_proxy_port}" {
+	txreq
+	rxresp
+	expect resp.status == 200
+	expect resp.http.http_first_request == "1"
+} -run
+
+## fourth request, reuse proxy protocol
+client c_proxy -connect ${h1_feS_proxy_sock} -proxy1 "127.0.0.1:50000 ${h1_feS_proxy_addr}:${h1_feS_proxy_port}" {
+	txreq
+	rxresp
+	expect resp.status == 200
+	expect resp.http.http_first_request == "0"
+
+	txreq
+	rxresp
+	expect resp.status == 200
+	expect resp.http.http_first_request == "0"
+} -run