pgaudit/set_user REL1_4_0

REL_1_4_0

on GitHub

Add untrusted set_user and superuser whitelist
This patch adds two new functionalities:

• Distinguish between superuser escalation and normal set_user through use of
  the 'set_user_u' function.
• Add granular control over which PostgreSQL roles can escalate to
  superuser.

Previously, we relied on only the Block_SU GUC to toggle all superuser
escalation privileges.