backend health checks and 204

[Tollef Fog Heen]

]] David Birdsong 

| I couldn't find this anywhere, so apologies if it's already been hashed out.
| 
| Would it be possible for the backend health checks to be altered to
| consider a 204 response from a backend as healthy?

The attached patch does that.  It's against trunk.  phk, please review
and ack/nack.  (It needs documentation and possibly a test case.)

-- 
Tollef Fog Heen 
Redpill Linpro -- Changing the game!
t: +47 21 54 41 73
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