Address already in use

* Every Spark Application binds to an admin port for the admin UI - including Zeppelin which is a long-running Spark Application (similar to Spark Streaming)

* Spark will start at port 4040 and +1 until it finds an open port - throwing a WARN on every attempt

* When you start Zeppelin, for example, this will bind to the first available port after 4040

* We usually start Zeppelin first, so this usually binds to port 4040, but every Spark job after will throw a scary WARN.

* Ignore this for now

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