R removes JObject from RBackend
R removes JObject from RBackend

* Deletes var from  .validJobjs env
* Ommits CustomCodeEntryPoint (id == '0')

Change-Id: I0442571e992e5618af7fd5e21d878f028675323d

deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor