Change default values for backup and replication parameters

Magnus Hagander <magnus@hagander.net>

Commit: f6d6d2920d2cddc4b381cbbf2915db9d985d20a9
Author: Magnus Hagander <magnus@hagander.net>
Date: 2017-01-14T16:14:56Z
Releases: 10.0
Change default values for backup and replication parameters

This changes the default values of the following parameters:

wal_level = replica
max_wal_senders = 10
max_replication_slots = 10

in order to make it possible to make a backup and set up simple
replication on the default settings, without requiring a system restart.

Discussion: https://postgr.es/m/CABUevEy4PR_EAvZEzsbF5s+V0eEvw7shJ2t-AUwbHOjT+yRb3A@mail.gmail.com

Reviewed by Peter Eisentraut. Benchmark help from Tomas Vondra.

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