BUG/MEDIUM: lua: socket timeouts are not applied

Sachin Shetty reported that socket timeouts set in LUA code have no effect.
Indeed, connect timeout is never modified and is always set to its default,
set to 5 seconds. Currently, this patch will apply the specified timeout
value to the connect timeout.
For the read and write timeouts, the issue is that the timeout is updated but
the expiration dates were not updated.

This patch should be backported up to the 1.6 branch.
diff --git a/src/hlua.c b/src/hlua.c
index c29a7cc..06c1155 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -2574,10 +2574,19 @@
 	si = appctx->owner;
 	s = si_strm(si);
 
+	s->sess->fe->timeout.connect = tmout;
 	s->req.rto = tmout;
 	s->req.wto = tmout;
 	s->res.rto = tmout;
 	s->res.wto = tmout;
+	s->req.rex = tick_add_ifset(now_ms, tmout);
+	s->req.wex = tick_add_ifset(now_ms, tmout);
+	s->res.rex = tick_add_ifset(now_ms, tmout);
+	s->res.wex = tick_add_ifset(now_ms, tmout);
+
+	s->task->expire = tick_add_ifset(now_ms, tmout);
+	task_queue(s->task);
+
 	xref_unlock(&socket->xref, peer);
 
 	lua_pushinteger(L, 1);