Rewrite the banner to include the NiFi version and that it is Docker
Rewrite the banner to include the NiFi version and that it is Docker

This blatantly stolen from
https://github.com/apiri/dockerfile-apache-nifi. I think it could be
improved a little bit by providing the image tag to the user, so they
know what Docker repository/image they are using. This is still helpful
information to the user, so it makes sense to include it.

mkobit/docker-nifi,GDATAAdvancedAnalytics/docker-nifi,mkobit/docker-nifi,GDATAAdvancedAnalytics/docker-nifi