[oozie] Option to return coordinator id instead of redirect in coordinator submission popup

The idea is that when we submit the schedule from the editor, we should get a json back instead of a redirect to the coord page.

Return json if format asked json?
https://github.com/cloudera/hue/blob/master/apps/oozie/src/oozie/views/editor2.py#L453

Here add a $post hook or something?
https://github.com/cloudera/hue/blob/master/apps/oozie/src/oozie/templates/editor2/submit_job_popup.mako