9696 add /etc/system.d support
Portions contributed by: Andy Fiddaman <andy@omniosce.org>
Reviewed by: Hans Rosenfeld <hans.rosenfeld@joyent.com>
Reviewed by: Peter Tribble <peter.tribble@gmail.com>
Reviewed by: C Fraire <cfraire@me.com>
Reviewed by: Toomas Soome <tsoome@me.com>

@@ -1,6 +1,5 @@
-*ident  "%Z%%M% %I%     %E% SMI" /* SVR4 1.5 */
 *
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only

@@ -22,10 +21,22 @@
 *
 *
 * SYSTEM SPECIFICATION FILE
 *
 
+* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! NOTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+*
+* It is not recommended to edit this file directly but rather
+* to deliver configuration fragments into files under /etc/system.d;
+* files in /etc/system.d are combined in alphabetical order and read by
+* the kernel before this file (/etc/system) is processed.
+*
+* Refer to the system(4) manual page for more information and
+* recommendations on naming fragment files.
+*
+* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! NOTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
 * moddir:
 *
 *       Set the search path for modules.  This has a format similar to the
 *       csh path variable. If the module isn't found in the first directory
 *       it tries the second and so on. The default is /kernel /usr/kernel