Add reasonForIncompletion to ConductorWorker.py
Add reasonForIncompletion to ConductorWorker.py

Introduces the 'reasonForIncompletion' key into the task result returned by the python client. This key is used to display the failure reason for a task in the conductor UI. It is implemented as an optional key so that successful tasks need not designate a reason, and to maintain backwards compatibility.
Netflix/conductor,Netflix/conductor,Netflix/conductor,Netflix/conductor,Netflix/conductor