TEST: Add SCSI.Unmap.UnmapVPD and see if UNMAP availability matches

the VPD settings.

If UNMAP is not available then LBPU must be clear
and if UNMAP is available then both LBPME and LBPU must be set.

test-tool/iscsi-test-cu.h

@@ -154,6 +154,7 @@ void test_testunitready_simple(void);
 
 void test_unmap_simple(void);
 void test_unmap_0blocks(void);
+void test_unmap_vpd(void);
 
 void test_verify10_simple(void);
 void test_verify10_beyond_eol(void);