REGTEST: Add a script to validate agent checks

reg-tests/checks/agent-check.vtc

@@ -0,0 +1,36 @@
+varnishtest "Health-checks: agent-check"
+#REGTEST_TYPE=slow
+feature ignore_unknown_macro
+
+barrier b1 cond 2 -cyclic
+barrier b2 cond 2 -cyclic
+
+server s1 {
+  barrier b1 sync
+  recv 5
+  send "75%,max-conn:30,maint,down\n"
+  barrier b2 sync
+} -start
+
+
+haproxy h1 -conf {
+    defaults
+        mode tcp
+        timeout client 1s
+        timeout server 1s
+        timeout connect 100ms
+
+    backend be1
+        log ${S1_addr}:${S1_port} daemon
+        option log-health-checks
+        server srv ${s1_addr}:${s1_port} weight 100 agent-check agent-addr ${s1_addr} agent-port ${s1_port} agent-send "pouet" agent-inter 100ms
+} -start
+
+haproxy h1 -cli {
+    send "show servers state"
+    expect ~ "be1 1 srv 127.0.0.1 2 0 100 100 [[:digit:]]+ 1 0 [[:digit:]] 0 [[:digit:]]+ 0 0 - ${s1_port} -"
+    barrier b1 sync
+    barrier b2 sync
+    send "show servers state"
+    expect ~ "be1 1 srv 127.0.0.1 0 1 75 100 [[:digit:]]+ 1 0 [[:digit:]] 0 [[:digit:]]+ 0 0 - ${s1_port} -"
+}