Add payload fail action custom handler

[jeff-kilbride]

Hi All,

This PR adds a custom handler implementation to the route payload failAction, much like the route validate failAction. It addresses #3509.

I have also added tests for the three string failAction types, along with a test for the new functionality.

I'm consistently getting an error in one test locally that was present before I made these changes:

Failed tests:

  757) transmission transmit() handles stream errors on the response after the response has been piped (inject):

      Timed out (3000ms) - transmission transmit() handles stream errors on the response after the response has been piped (inject)

Just a head's up.

Thanks!

[jeff-kilbride]

I'm using node v6.11.0 locally and it looks like the error I'm getting is also showing up in travis in v4 and v6. It also looks like v4 handles the payload error logged to request-internal a bit differently.

[lock]

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