Port SparkSubmit to our implementation

[GeorgeJahad]

Modify it to support cluster-mode with the ArmadaClientApplication, as done here:

spark/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala

Lines 881 to 882 in 8e90e55

	if (isArmadaCluster) {
	childMainClass = ARMADA_CLUSTER_SUBMIT_CLASS

[GeorgeJahad]

This was completed as part of #42

Closing