[Tile-serving] [openstreetmap/mod_tile] "Failed to read cmd on fd" errors since mod_tile update on 2nd June (#77)

[cglacet]

Sadly this is the only "bad thing" that seems to happen. I'm actually looking for a way to have any kind of debugging option (showing more debug messages would be nice) because I really have no idea what is happening, but renderD seems to never send anything to mod_tile (or apache I don't know). It may be a lot of things, but these tools are very laconic (or I have no idea on how to make them talk a bit to me). 

Here is what is happening when the tile is built: 

```
Jun 11 17:30:56  renderd[22663] <Debug>: Rendering projected coordinates 8 248 160 -> 18785164.071375|-6261721.357125 20037508.342800|-5009377.085700 to a 8 x 8 tile
Jun 11 17:31:00  renderd[22663] <Debug>: DEBUG: DONE TILE default 8 248-255 160-167 in 3.939 seconds
debug: Creating and writing a metatile to /var/lib/mod_tile/default/8/0/0/0/250/128.meta

Jun 11 17:31:00  renderd[22663] <Debug>: DEBUG: Sending render cmd(3 default 8/251/160) with protocol version 2 to fd 5
Jun 11 17:31:00  renderd[22663] <Info>: DEBUG: Failed to read cmd on fd 5
Jun 11 17:31:00  renderd[22663] <Debug>: DEBUG: Connection 0, fd 5 closed, now 0 left
```

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