[SPARK-11449][CORE] PortableDataStream should be a factory

```PortableDataStream``` maintains some internal state. This makes it tricky to reuse a stream (one needs to call ```close``` on both the ```PortableDataStream``` and the ```InputStream``` it produces).

This PR removes all state from ```PortableDataStream``` and effectively turns it into an ```InputStream```/```Array[Byte]``` factory. This makes the user responsible for managing the ```InputStream``` it returns.

cc srowen

Author: Herman van Hovell <hvanhovell@questtec.nl>

Closes #9417 from hvanhovell/SPARK-11449.

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