[Tile-serving] [openstreetmap/mod_tile] Allow connections over TCP besides Unix sockets for tools (#263)

[Stephan Austermühle]

Signed-off-by: Stephan Austermühle <au at hcsd.de>

Fixes #137 

This PR allows tools like `render_list` to connect to `renderd` over network instead of local Unix sockets allowing for easy separation of `mod_tile` and `renderd`. Also, it enables connecting to dynamically scaling `renderd` instances (e.g., when deployed on a Kubernetes cluster). Simply pass `-s ‹hostname›:‹tcpPort›` instead of a Unix socket path to use.

Feedback on this PR is welcome.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/263

-- Commit Summary --

  * Allow connections over TCP besides Unix sockets

-- File Changes --

    M includes/protocol.h (2)
    M src/render_list.c (2)
    M src/render_submit_queue.c (133)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/263.patch
https://github.com/openstreetmap/mod_tile/pull/263.diff

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