Data Processing Adding support for Spark jobs

This patch adds support for Spark EDP jobs in the
data processing dashboard.  The changes are:
* Add Spark as a job type when creating jobs
* Add some help text for Spark job creation
* Hide appropriate configuration fields when
  launching a Spark job
* Making job type dropdown translateable

Change-Id: I90c0de2cd61110db67673efaec5c9b4ef7f1618f
Implements: blueprint data-processing-spark-support
Merge "Data Processing Adding support for Spark jobs"