Remove APT cache for Dockerfile

[patsevanton]

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Enables X functionality; fixes bug NIFI-YYYY.

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[MikeThomsen]

This step removes the apt lists which is an unnecessary step that could cause confusion for people who extend the docker image.

[MikeThomsen]

This step removes the apt lists which is an unnecessary step that could cause confusion for people who extend the docker image.

[patsevanton]

Ok