Update EDP doc
Update EDP doc

* Review in general.
* Add information on Java job types
* Include HDFS for data sources
* Expand the workflow section and give detail on
  each job type plus information on congis, parameters, and args

Change-Id: I059a58cf99d841b5541072105178bade85cf21e1

citrix-openstack-build/sahara,tellesnobrega/sahara,redhat-openstack/sahara,zhangjunli177/sahara,tellesnobrega/storm_plugin,ekasitk/sahara,henaras/sahara,openstack/sahara,henaras/sahara,zhangjunli177/sahara,zhujzhuo/Sahara,esikachev/scenario,ekasitk/sahara,henaras/sahara,bigfootproject/sahara,zhujzhuo/Sahara,egafford/sahara,esikachev/sahara-backup,xme1226/sahara,esikachev/sahara-backup,zhujzhuo/Sahara,keedio/sahara,bigfootproject/sahara,xme1226/sahara,mapr/sahara,citrix-openstack-build/sahara,ekasitk/sahara,matips/iosr-2015,mapr/sahara,mapr/sahara,crobby/sahara,bigfootproject/sahara,citrix-openstack-build/sahara,esikachev/scenario,zhangjunli177/sahara,xme1226/sahara,egafford/sahara,tellesnobrega/sahara,redhat-openstack/sahara,redhat-openstack/sahara,crobby/sahara,tellesnobrega/storm_plugin,keedio/sahara,matips/iosr-2015,tellesnobrega/storm_plugin,openstack/sahara,crobby/sahara,keedio/sahara,esikachev/sahara-backup,esikachev/scenario,matips/iosr-2015