Adding support for building docker image with TEAM engine installed

[tfr42]

This PR contains a Dockerfile for building a Docker image with OGC TEAM Engine using the spotify docker-maven-plugin.

To build the Docker image run in directory teamengine/teamengine-virtualization/ the Maven goals:

% mvn clean package docker:build

To run TEAM Engine inside the Docker container with the name teamengine on port 8088
with the previously built Docker image named opengis/teamengine execute:

% docker run -p 8088:8080 --name teamengine --rm opengis/teamengine