Ian Barwick 220ec7fc96 Minimize user permissions requirements for replication slots ...

Enable operations which create or drop replication slots to be carried
out with the minimum necessary user permissions, i.e. a user with the
REPLICATION attribute.

This can be the repmgr user, or a dedicated replication user.
In the latter case, if the dedicated replication user is only
permitted to make replication connections, the streaming
replication protocol is used to create/drop slots.

Implements part of GitHub #536.

2019-10-30 15:51:15 +09:00

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