Add retry mechanism

[steveizzle]

Plans/applies can fail often due to temporary reasons like bad network connectivity or whatever. I would now go on and implement some retry directly as custom workflow, but i think it would be great to have some kind of native retry mechanism in the atlantis configuration for the project.

[nishkrishnan]

You can just retry by typing atlantis plan or atlantis apply, I don't think we have the ability to tell when terraform returns a retriable error or not.