Bug fix: slave node ids were not correctly associate with the slave node.   This fix also makes the code more clear by storing node metadata in a dictionary rather than a tuple.
Bug fix: slave node ids were not correctly associate with the slave node.   This fix also makes the code more clear by storing node metadata in a dictionary rather than a tuple.

freeman-lab/spark_gce,broxtronix/spark-gce,freeman-lab/spark_gce,samklr/spark-gce,broxtronix/spark-gce,samklr/spark-gce