Remove some old XEN parents, the ptop list was getting too long.

utils/runsonxen.in

@@ -33,8 +33,7 @@ my $PROTOGENI_GENIRACK = @PROTOGENI_GENIRACK@;
 #
 # Mark an image as running on XEN. 
 #
-my @OTHER_PARENTS  = ("XEN44-64-BIGFS", "XEN44-64-THIN", "XEN44-64-STD",
-		      "XEN46-64-STD");
+my @OTHER_PARENTS  = ("XEN44-64-STD", "XEN46-64-STD");
 if ($PROTOGENI_GENIRACK) {
     push(@OTHER_PARENTS, "XEN44-64-GENIRACK");
 }