Import new protos.
Integration tests pass for non-executor tasks.
Updated stale link in executor test.
Remove stale comment.
Flipped conditional.
Support xcon6 executor convention.
Correct bad imports for protos.
Fix buggy logging.
Prefer tasks to executors (new defaulting rules).
Separate the observers err and out streams.
Fixes exit code handling.
More flexible command presenter.
Fork in launch()
Shutdown subprocesses before waiting.
Fix TASK_FAILED/TASK_FINISHED interleaving.

Because wait() and the observer can be running at the same time, it's hard to
say who will finish first.
Set deadline for runenr and observer.

If these go over, Deimos would never terminate.
Update Protos.
Implement containers() and recover().
Accept Docker URLs with an index spec in them.