Imager daemon no longer requires common

Stupid helper method.
imager/db has its own redis_client()
Imager db has its own redis conn if DAEMON is on
Imager db no longer caches in server/state
Introduce imager DAEMON and UPLOAD_URL config
Imager db has its own redis configuration
Log uploads in standalone
commit_image_alloc
Don't cache image alloc state
Imager-less server doesn't mkdir tmp
Support listening on unix sockets
Don't crash on unknown IP

It's possible when you listen on a unix socket.
Imager daemon makes its own tmp dir
Slightly more accurate deps
Extract IU.respond helper
Fallback for lack of cross-origin error handling
Better fallback check
Whitelist and verify imager upload-status calls
Consolidate image_upload_url()
Send Access-Control-Allow-Origin header