9696 add /etc/system.d support
Reviewed by: Dan Fields <dan.fields@nexenta.com>
Reviewed by: Roman Strashkin <roman.strashkin@nexenta.com>
Reviewed by: Cynthia Eastham <cynthia.eastham@nexenta.com>

@@ -14,10 +14,11 @@
 etc/name_to_major
 etc/name_to_sysnum
 etc/path_to_inst
 etc/rtc_config
 etc/system
+etc/system.d
 etc/hostid
 kernel
 platform/i86hvm/kernel
 platform/i86pc/kernel
 platform/i86xpv/kernel