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

[Darafei Praliaskouski]

Adjust render queue depth so that a rendering server dirty queue length is shifted from several minutes (1000 / 7 ~= 142 s  ~= 2.3 minutes) to a whole day.

Metrics are taken from http://munin.osm.org/static/dynazoom.html?cgiurl_graph=/munin-cgi/munin-cgi-graph&plugin_name=openstreetmap/yevaud.openstreetmap/renderd_processed&size_x=800&size_y=400&start_epoch=1483213021&stop_epoch=1483904221 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/152

-- Commit Summary --

  * Update render queue limits

-- File Changes --

    M includes/render_config.h (9)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/152.patch
https://github.com/openstreetmap/mod_tile/pull/152.diff

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