gaffer-docker

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In the hdfs and Accumulo Dockerfiles, users can provide their own builds of Accumulo, ZooKeeper and Hadoop to be used instead of building them inside the image: https://github.com/gchq/gaffer-docker/blob/e26dbe7e0575d1bcc078a38a624032dfabe68f5d/docker/accumulo/Dockerfile#L50-L54 This can save a lot of time with repeated builds. This cannot be done, however, for building hadoop inside the pyspark notebook Dockerfile: https://github.com/gchq/gaffer-docker/blob/e26dbe7e0575d1bcc078a38a624032dfabe68f5d/docker/gaffer-pyspark-notebook/Dockerfile#L34-L39

It would be great if this was added to that Dockerfile also.