[MEDIUM] pre-initialize timeouts to infinity, not zero

Since the timers have been changed, the timeouts for the default instance
have not been adjusted. This results in unspecified timeouts becoming zero
instead of infinite.

src/cfgparse.c

@@ -468,6 +468,10 @@ static void init_default_instance()
 	defproxy.maxconn = cfg_maxpconn;
 	defproxy.conn_retries = CONN_RETRIES;
 	defproxy.logfac1 = defproxy.logfac2 = -1; /* log disabled */
+	tv_eternity(&defproxy.clitimeout);
+	tv_eternity(&defproxy.contimeout);
+	tv_eternity(&defproxy.srvtimeout);
+	tv_eternity(&defproxy.appsession_timeout);
 }
 
 /*