Show indicator when client setup fails (#339)

Summary:
At the moment, when a client is failing to connect, you effectively get an infinite spinner, as it keeps retrying.

This keeps the spinner while it's retrying, but in between, shows a failure icon.

This isn't perfect. It's still shown under possibly the wrong device, but that already happens anyway, this just adds an extra icon.
Pull Request resolved: https://github.com/facebook/flipper/pull/339

Reviewed By: priteshrnandgaonkar

Differential Revision: D13319635

Pulled By: jknoxville

fbshipit-source-id: e16177ecc7058b779fb17b61e20fcbac8ccf0c29

src/server.js

@@ -192,7 +192,6 @@ export default class Server extends EventEmitter {
                 });
               })
               .catch(e => {
-                console.error(e, 'server');
                 subscriber.onError(e);
                 this.emit('client-setup-error', {client, error: e});
               });