[MEDIUM] now upon startup, haproxy will warn about missing timeouts.

Too many problem reports were caused by missing timeouts. While
there has never been any default value since version 1.0, having
no timeout is abnormal in networked environments, and will lead
to various problems such as CLOSE_WAIT sockets accumulating and
nasty things like this. For this reason, it's better to annoy
the users until they fix their configs than letting them run
buggy configurations.

src/cfgparse.c

@@ -1873,6 +1873,15 @@ int readcfgfile(char *file)
 			}
 		}
 
+		if ((curproxy->mode == PR_MODE_TCP || curproxy->mode == PR_MODE_HTTP) &&
+		    (!curproxy->clitimeout || !curproxy->contimeout || !curproxy->srvtimeout)) {
+			Warning("parsing %s : missing timeouts for listener '%s'.\n"
+				"   | While not properly invalid, you will certainly encounter various problems\n"
+				"   | with such a configuration. To fix this, please ensure that all following\n"
+				"   | values are set to a non-zero value: clitimeout, contimeout, srvtimeout.\n",
+				file, curproxy->id);
+		}
+		
 		/* first, we will invert the servers list order */
 		newsrv = NULL;
 		while (curproxy->srv) {