Refactor user-facing SQL functions signalling backends

Michael Paquier <michael@paquier.xyz>

Commit: 09921f397b84bdae8406f3dc6f473ead730a6dd3
Author: Michael Paquier <michael@paquier.xyz>
Date: 2018-10-04T09:27:25Z
Releases: 12.0
Refactor user-facing SQL functions signalling backends

This moves the system administration functions for signalling backends
from backend/utils/adt/misc.c into a separate file dedicated to backend
signalling.  No new functionality is introduced in this commit.

Author: Daniel Gustafsson
Reviewed-by: Michael Paquier, Álvaro Herrera
Discussion: https://postgr.es/m/C2C7C3EC-CC5F-44B6-9C78-637C88BD7D14@yesql.se

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