Commits on Jan 16, 2018

1. Introduce communication channel from workflow-controller to executor … …

   …through pod annotations
   
   This change creates a downward communication channel from the controller to executor through
   the use of pod annotations. Its initial use will be to terminate daemoned containers by
   updating 'ExecutionControl' parameters to the executor. In this case, it updates the deadline
   value to be a zero-value timestamp. The executor now monitors updates to the annotations and
   will use the updated deadline, allowing deadlines to be set/updated/unset after initial start.
   
   In the future, ExecutionControl can be extended to support things like workflow, step, dag
   level timeouts, as well as the ability to to cancel a workflow without deleting pods.

   

   jessesuen committed Jan 16, 2018
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