Bug in packaging Dockerfile's EXPOSE

[sfariaNG]

The Dockerfile at https://github.com/Alfresco/share/blob/master/packaging/docker/Dockerfile uses EXPOSE 8000 but the base image appears to be listening at port 8080. I believe this should be changed to EXPOSE 8080. Noticed this since it caused a problem for us when deploying to Cloud Foundry so we have to build our own and update the EXPOSE for it to work.