Michael Schurter ee17940dfe Add Driver.Prestart method ...

The Driver.Prestart method currently does very little but lays the
foundation for where lifecycle plugins can interleave execution _after_
task environment setup but _before_ the task starts.

Currently Prestart does two things:

* Any driver specific task environment building
* Download Docker images

This change also attaches a TaskEvent emitter to Drivers, so they can
emit events during task initialization.

2016-12-02 11:03:48 -08:00

7.8 KiB

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