[Tile-serving] [mod_tile] Fix munin plugin bugs (#45)

[Tom Hughes]

You can merge this Pull Request by running:

  git pull https://github.com/tomhughes/mod_tile munin

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/mod_tile/pull/45

-- Commit Summary --

  * Correct axis label for renderd_queue_time munin graph
  * Correct derivation expression for renderd_zoom_time munin graph

-- File Changes --

    M munin/renderd_queue_time (2)
    M munin/renderd_zoom_time (4)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/45.patch
https://github.com/openstreetmap/mod_tile/pull/45.diff

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