Use hba_file/ident_file GUCs rather than pg_hba.conf/pg_ident.conf in logs

This is particularly useful when log_min_messages is set to FATAL, so as
one can know which file was not getting loaded whether hba_file or
ident_file are set to some non-default values.  If using the default
values of these GUC parameters, the same reports are generated.

This commit changes the load (startup) and reload (SIGHUP) messages.

Author: Julien Rouhaud
Discussion: https://postgr.es/m/20220223045959.35ipdsvbxcstrhya@jrouhaud

Author: michaelpq

src/backend/postmaster/postmaster.c

@@ -1419,7 +1419,8 @@ PostmasterMain(int argc, char *argv[])
 		 * since there is no way to connect to the database in this case.
 		 */
 		ereport(FATAL,
-				(errmsg("could not load pg_hba.conf")));
+		/* translator: %s is a configuration file */
+				(errmsg("could not load %s", HbaFileName)));
 	}
 	if (!load_ident())
 	{
@@ -2769,11 +2770,11 @@ SIGHUP_handler(SIGNAL_ARGS)
 		if (!load_hba())
 			ereport(LOG,
 			/* translator: %s is a configuration file */
-					(errmsg("%s was not reloaded", "pg_hba.conf")));
+					(errmsg("%s was not reloaded", HbaFileName)));
 
 		if (!load_ident())
 			ereport(LOG,
-					(errmsg("%s was not reloaded", "pg_ident.conf")));
+					(errmsg("%s was not reloaded", IdentFileName)));
 
 #ifdef USE_SSL
 		/* Reload SSL configuration as well */

src/backend/utils/init/postinit.c

@@ -217,7 +217,8 @@ PerformAuthentication(Port *port)
 		 * since there is no way to connect to the database in this case.
 		 */
 		ereport(FATAL,
-				(errmsg("could not load pg_hba.conf")));
+		/* translator: %s is a configuration file */
+				(errmsg("could not load %s", HbaFileName)));
 	}
 
 	if (!load_ident())