runit sends TERM per default if it wants to down a service.
For postgres this means it will go into "smart shutdown mode" [1] and
wait until the last client disconnects and only then shut down. This
can lead to unproper termination of postgres, especially on
shutdowns/reboots.
This change overrides runits default beharviour by sending INT instead
so postgres will go into "fast shutdown mode" [1], which will make
postgres exit as promptly as possible.
[1] https://www.postgresql.org/docs/9.6/server-shutdown.html
58a3a5b1a4