remove httpPort

we can just use container IP instead of all this httpPort exporting magic.
this is also required for exposing httpPaths feature (we have to otherwise
have multiple httpPorts).

src/apphealthmonitor.js

@@ -85,8 +85,11 @@ function checkAppHealth(app, callback) {
         // non-appstore apps may not have healthCheckPath
         if (!manifest.healthCheckPath) return setHealth(app, apps.HEALTH_HEALTHY, callback);
 
+        const ip = safe.query(data, 'NetworkSettings.Networks.cloudron.IPAddress', null);
+        if (!ip) return setHealth(app, apps.HEALTH_ERROR, callback);
+
         // poll through docker network instead of nginx to bypass any potential oauth proxy
-        var healthCheckUrl = 'http://127.0.0.1:' + app.httpPort + manifest.healthCheckPath;
+        var healthCheckUrl = `http://${ip}:${manifest.httpPort}${manifest.healthCheckPath}`;
         superagent
             .get(healthCheckUrl)
             .set('Host', app.fqdn) // required for some apache configs with rewrite rules