Adding Keystone environment variables to NBI

Adding Keystone environment variables to NBI

Adding the necessary environment variables to the
NBI MDG Dockerfile in order for the Keystone authentication
to work.

Completing the docker-compose yaml, fixing renaming typo
in keystone dockerfile and updating environment file
creation.

Change-Id: I4eb15119f4dba304494ef16fc90eea8d8c230927
Signed-off-by: Eduardo Sousa <esousa@whitestack.com>