Do not set Hostname for subcontainers

src/docker.js

@@ -161,7 +161,8 @@ function createSubcontainer(app, name, cmd, options, callback) {
         var containerOptions = {
             name: name, // used for filtering logs
             // do _not_ set hostname to app fqdn. doing so sets up the dns name to look up the internal docker ip. this makes curl from within container fail
-            Hostname: semver.gte(targetBoxVersion(app.manifest), '0.0.77') ? app.location : config.appFqdn(app.location),
+            // for subcontainers, this should not be set because we already share the network namespace with app container
+            Hostname: isAppContainer ? (semver.gte(targetBoxVersion(app.manifest), '0.0.77') ? app.location : config.appFqdn(app.location)) : null,
             Tty: isAppContainer,
             Image: app.manifest.dockerImage,
             Cmd: cmd,