[Tile-serving] [openstreetmap/mod_tile] Logging Improvements (#220)

[hummeltech]

* Standardized usage of `{LOG_PRIORITY}: ` prefix in log messages
* Changed calls to `fprintf(stderr` to `syslog` calls
* Extended `renderd` log priority onto Mapnik's logger
* Changed `0`,`1` to `no_argument`,`required_argument` & fixed `foreground`
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/220

-- Commit Summary --

  * Logging Improvements

-- File Changes --

    M includes/daemon.h (1)
    M src/daemon.c (201)
    M src/gen_tile.cpp (56)
    M src/mod_tile.c (2)
    M src/parameterize_style.cpp (6)
    M src/render_expired.c (2)
    M src/render_list.c (2)
    M src/store.c (50)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/220.patch
https://github.com/openstreetmap/mod_tile/pull/220.diff

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