Remove code duplication for permission checks with replication slots

Michael Paquier <michael@paquier.xyz>

Commit: 026ed8efd6b1d774924937baf3209b676df4531f
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-09-14T01:15:49Z
Releases: 15.0
Remove code duplication for permission checks with replication slots

Two functions, both named check_permissions(), used the same checks to
verify if a user had required privileges to work on replication slots.
This commit removes the duplication, and moves the function doing the
checks to slot.c to be centralized.

Author: Bharath Rupireddy
Reviewed-by: Nathan Bossart, Euler Taveira
Discussion: https://postgr.es/m/CALj2ACUPpVw1u7sQocFVWrSs0n10pt_G_4NPZKSxXK6cW1dErw@mail.gmail.com

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