Fix Dockerfile to build with correct dependencies in master

The current Dockerfile in master is broken per current dependencies build requirements (not python requirements, but tools and headers for non-python build dependencies).  These two additions to the apt-get install command allow the Dockerfile to properly build a registry that can be run as a Docker container.

Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)