[iscsi] Change default initiator name prefix to "iqn.2000-01.org.etherboot:"

The domain etherboot.org was actually registered on 2000-01-09, not
2000-09-01.  (To put it another way, it was registered on 1/9/2000 (US
date format) rather than 1/9/2000 (sensible date format); this may
illuminate the cause of the error.)

"iqn.2000-09.org.etherboot:" is still valid as per RFC3720, but may be
surprising to users, so change it to something less unexpected.

Thanks to the anonymous contributor for pointing this one out.

src/net/tcp/iscsi.c

 	{
 		.setting = &hostname_setting,
 		.string = &iscsi_default_initiator_iqn,
-		.prefix = "iqn.2000-09.org.etherboot:",
+		.prefix = "iqn.2000-01.org.etherboot:",
 	},
 };