[Tile-serving] [openstreetmap/mod_tile] mod_tile runs into timeout because renderd does not send a response for low priority queue requests (#205)

[seemoritz]

if you touch `planet-import-complete` and request an existing tile:
- mod_tile will send a command with `cmdRenderLow`
- renderd will queue this request in `queueRequestLow`
- however when the rendering is done renderd will fail to send a response (`cmdRenderLow` not handled in `send_response`)
- mod_tile will run into a timeout (`ModTileRequestTimeout`) and then serve a tile from file it thinks is outdated but was actually rerendered in the meantime

this PR should fix the issue in `send_response`
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/205

-- Commit Summary --

  * fixed issue were renderd does not send a response for low priority queue

-- File Changes --

    M src/daemon.c (2)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/205.patch
https://github.com/openstreetmap/mod_tile/pull/205.diff

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