[Tile-serving] [openstreetmap/mod_tile] Update render queue limits (#152)

[Darafei Praliaskouski]

The values are tailored based on osm.org statistics.

On non-osm.org installs:
 - if it's a local small install, the queue just won't grow. No major change.
 - if it's a popular but not overloaded install, the queue will grow in the same fashion as on osm.org, and will be shrinking on non-popular hours. Starting from day 2 the number of fresh tiles served from cache directly grows, outweighing the queuing overhead by a lot. 
 - if it's an overloaded install, the queue would be large and won't shrink. This adds some time for queuing, but this shouldn't be noticeable as the install is overloaded and is unable to serve tiles on time anyway.

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