REL_14_21
tests: Rename conflicting role names
adminpack: Add test suite
Remove references to libpq_srcdir in adminpack and old_snapshot
adminpack: Revoke EXECUTE on pg_logfile_rotate()
Throw a useful error message if an extension script file is fed to psql.
Add pg_file_sync() to adminpack extension.
Rename Default Roles to Predefined Roles