Added automated_service_info field alongside automated flag to 

provide details on the service that updated/closed the review 

request automatically.


Added automated_service_info field to hook_utils, 

ReviewRequestResourceAPI Update(), and 

review_request.close() to store the value in 

ChangeDescription model. 



Added automated_service_info field to

ReviewRequestResourceDraftAPI Update(), Create(),

review_request.publish(), draft.publish() to store the value 

in ChangeDescription model. 



Added  automated_service_info field to closed/published 

signals and email-related methods.

Added unit tests to test_email_sending.py

Added unit tests to test_review_request.py

Added unit tests to test_review_request_draft.py

Added unit tests to webapi/tests/test_review_request.py

Added unit tests to webapi/tests/test_review_request_draft.py

Added assertion to test_github.py, test_rbgateway.py, 

test_bitbucket.py
All tests passed.