Move SCRAM-related name definitions to scram-common.h

Peter Eisentraut <peter_e@gmx.net>

Commit: 25d532698d74f4adb34f013f1a287a0029e31fb1
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-12-18T21:59:48Z
Releases: 11.0
Move SCRAM-related name definitions to scram-common.h

Mechanism names for SCRAM and channel binding names have been included
in scram.h by the libpq frontend code, and this header references a set
of routines which are only used by the backend.  scram-common.h is on
the contrary usable by both the backend and libpq, so getting those
names from there seems more reasonable.

Author: Michael Paquier <michael.paquier@gmail.com>

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