Log Message:
Update the NetBSD iSCSI target to version 20060520:

Adjust the data VPD returns, to work around a problem in the Cisco
initiator (used on Solaris 10 Update 1) - the initiator demands that a
UUID is returned, so give it one.

Add autoconf glue for that, and a compat uuid_create(3) and
uuid_to_string(3).

This still spews a lot of output via the target's syslog, but persevere,
since it does actually make the target work with the Solaris initiator:

        solaris10# format
        Searching for disks...done

        AVAILABLE DISK SELECTIONS:
               0. c1d0 <DEFAULT cyl 29728 alt 2 hd 64 sec 63>
                  /pci@0,0/pci-ide@1f,1/ide@0/cmdk@0,0
               1. c2t5d0 <DEFAULT cyl 96 alt 2 hd 64 sec 32>
                  /iscsi/disk@0000iqn.1994-04.org.netbsd.iscsi-target%3Atarget00001,0
        Specify disk (enter its number): ^D
        solaris10# df -k /mnt
        Filesystem            kbytes    used   avail capacity  Mounted on
        /dev/dsk/c2t5d0s0      91407    1041   81226     2%    /mnt
        solaris10# uname -a
        SunOS solaris10 5.10 Generic_118844-26 i86pc i386 i86pc
        solaris10#