[Tile-serving] [openstreetmap/mod_tile] Enable keepalives for TCP connections to renderd (Issue #270)

[Stephan Austermühle]

PR #263 provides TCP connections to `renderd`. However, when there is a load balancer (or Kubernetes service backed by the Linux IPVS, in my case) between `render_list` and `renderd`, it silently closes TCP connections due to inactivity (because `renderd` is busy) after some time (15 minutes, in my case) causing `render_list` to fail. Enabling TCP keepalives on the socket should keep the connection alive.

I am preparing a PR for this.

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