[PATCH] Allow returning abandon from vcl_backend_error{}

[Federico Schwindt]

Hi,

Currently if you want to have all your error handling in a single place,
i.e. vcl_synth{}, and you end up in vcl_backend_error{} you have to either
return retry and then abandon in vcl_backend_fetch{} or return deliver and
in vcl_deliver{} return synth.

I can't think of any reason for not allowing this so the attached patch
lifts this restriction.

Comments? OKs?
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