reEnqueuePeriodicTaskIfException

[dasagan]

Fix: Exception in periodic task stops this task queue
New task option: reEnqueuePeriodicTaskIfException

Solves #1308

[evantahler]

Thank you for contributing!

Aside from the failing linter check, please also add a test to ensure that this behavior is "locked in" for the future. There are examples of writing tests for tasks here https://github.com/actionhero/actionhero/blob/master/__tests__/core/tasks.js

I suggest that the spec would:

1. mock out a task that raises an exception
2. runs the task
3. checks that the task definition is still enqueued for another run in the delayed queue(s)

This is going to be a rather involved test, so please ask for help if you need it!

[evantahler]

Thank you for your work @dasagan! I've been asking a lot of folks for their opinion on this, and it turns out that we should make the default behavior to re-enqueue if there is a failure. It's more surprising that recurring tasks... aren't recurring.

I'm going to merge your work in, but change the option around so the default option is actually to re-enqueue failing tasks.

#1312