Remove get_attidentity()

Peter Eisentraut <peter_e@gmx.net>

Commit: 5d7c703a44101f0d686fb66f4ff671429f46a84c
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-10-23T12:47:14Z
Releases: 12.0
Remove get_attidentity()

All existing uses can get this information more easily from the
relation descriptor, so the detour through the syscache is not
necessary.

Reviewed-by: Michael Paquier <michael@paquier.xyz>

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