Our current implementation of TC MongoDB deployments doesn't support authentication

The following things need to be added / modified

• when enabled a keyFIle needs to be generated prior to executing docker-entrypoint.sh
• aforementioned keyfile needs to be passed to the the docker-entrypoint.sh script
• root user must be created
• default connection string ought to include root credentials by default when authentication is enabled (in order to keep backwards compatibility)
• additional overload of MongoDbDeployment.getConnectionString(username, password) ought to be provided. Defaulting to UnsupportedOperationException