[Tile-serving] [openstreetmap/mod_tile] Enable TCP keepalives for render_list connections to renderd (PR #271)

[Stephan Austermühle]

This PR allows enabling and customizing TCP keepalives to better cope with load balancers silently closing connections.

Feedback is welcome.

Fixes #263 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/271

-- Commit Summary --

  * Add support for TCP keepalives
  * Provide keepalive config in all apps
  * Make TCP keepalive parameters configurable

-- File Changes --

    M includes/protocol.h (10)
    M src/render_expired.c (4)
    M src/render_list.c (58)
    M src/render_old.c (4)
    M src/render_submit_queue.c (43)
    M src/speedtest.cpp (4)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/271.patch
https://github.com/openstreetmap/mod_tile/pull/271.diff

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