[notebook] Error while share documents(user can save document with only read permissions)

STR:
1. Create new document
2. Share only read test_user
3. Login test_user 
4. Change shared document and run (After running, historify will change document id that will allow user to save it)
5. Save document

Actual results: 
Document saved

Expected results: 
Document not saved

 

 

https://review.cloudera.org/r/13800/

https://github.com/cloudera/hue/pull/831