REGTESTS: httpclient/lua: test the lua task timeout with the httpclient

Test the httpclient when the lua action timeout. The lua timeout is
reached before the httpclient is ended. This test that the httpclient
are correctly cleaned when destroying the hlua context.

Must be backported as far as 2.5.

reg-tests/lua/httpclient_action.lua

@@ -0,0 +1,8 @@
+function test()
+	local httpclient = core.httpclient()
+	local response = httpclient:get{url="http://127.0.0.1", headers={ [ "Host" ] = { "localhost" } }}
+
+end
+
+
+core.register_action("test", {"tcp-req"}, test, 0)

reg-tests/lua/httpclient_action.vtc

@@ -0,0 +1,39 @@
+varnishtest "Lua: test the httpclient when the lua action timeout"
+#
+# Start an httpclient from "lua.test" whose lua task will expire before the
+# httpclient is ended.
+
+
+feature cmd "$HAPROXY_PROGRAM -cc 'version_atleast(2.5-dev7)'"
+feature ignore_unknown_macro
+
+#REQUIRE_OPTIONS=LUA
+
+haproxy h1 -conf {
+
+    global
+        lua-load ${testdir}/httpclient_action.lua
+    defaults
+        mode                    tcp
+        timeout http-request    10s
+        timeout queue           1m
+        timeout connect         10s
+        timeout client          1m
+        timeout server          1m
+        timeout check           10s
+
+   listen li1
+       mode http
+       bind "fd@${fe1}"
+       tcp-request inspect-delay 10ms
+       tcp-request content lua.test
+       http-request return status 503
+
+} -start
+
+client c0 -connect ${h1_fe1_sock} {
+    txreq
+    rxresp
+    expect resp.status == 503
+} -run
+