Remove hint about hash indexes entirely.

Anyone needing them, particularly in a replication context, should
know what they're doing anyway.

See also: http://www.postgresql.org/docs/current/interactive/sql-createindex.html#AEN74175

"Also, changes to hash indexes are not replicated over streaming or file-based
 replication after the initial base backup, so they give wrong answers to
 queries that subsequently use them. For these reasons, hash index use is presently
 discouraged."

repmgr.c

@@ -1939,9 +1939,6 @@ do_standby_promote(void)
 
 	log_notice(_("STANDBY PROMOTE successful\n"));
 
-	/* XXX this is probably misleading */
-	log_hint(_("You should REINDEX any hash indexes you have.\n"));
-
 	/* Log the event */
 	create_event_record(conn,
 						&options,