add 'processing' state to challenges #382
Merged
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For #380 (comment).
Keeping track of when a challenge is in the
processing
state means we will be able to then include aRetry-After
response header for authorizations, as described in:One extra side effect here is that clients will no longer be able to cause Pebble to queue up a
pending
challenge multiple times for processing by a VA. This seems like a good thing anyway.