HDFS container for GeoDocker Cluster

This container has three roles that can be supplied as CMD:

• name - HDFS namenode
• sname - HDFS secondary namenode
• data - HDFS data node

Configuration can be done by either providing the required environment variables such that a minimal configuration can be templated or by volume mounting hadoop configuration directory to /etc/hadoop/conf

• HADOOP_MASTER_ADDRESS - hostname for HDFS root, required for all roles

This container should be tested with docker-compose and through make test