Add pg_alterckey utility to change the cluster key

Bruce Momjian <bruce@momjian.us>

Commit: 62afb42a7f9f533efc6c19f462c3a848fa4ddb63
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-12-26T01:24:53Z
Releases: 14.0
Add pg_alterckey utility to change the cluster key

This can change the key that encrypts the data encryption keys used for
cluster file encryption.

Discussion: https://postgr.es/m/20201202213814.GG20285@momjian.us

Backpatch-through: master

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