This change adds the Shell job type, currently implemented for the
Oozie engine (per spec).
Oozie shell actions provide a great deal of flexibility and will
empower users to easily customize and extend the features of Sahara
EDP as needed. For example, a shell action could be used to manage
hdfs on the cluster, do pre or post processing for another job
launched from Sahara, or run a data processing job from a
specialized launcher that does extra configuration not otherwise
available from Sahara (ie, setting a special classpath for a Java job).
Change-Id: I0d8b59cf55cf583f0d24c2c8c2e487813d8ec716
Implements: blueprint add-edp-shell-action
36881a9cba