Fix mismatch for other 'size' attributes

There may be multiple attributes with the word 'size' in it,
correct by matching the whole key value by including
the containing {} characters.

xCAT-server/share/xcat/install/scripts/getinstdisk

@@ -44,7 +44,7 @@ if [ -z "$install_disk" ]; then
 
     # Classify entries by DEVTYPE
     for entry in $entries; do
-        DEVSIZE=$(udevadm info --attribute-walk --name=$entry|grep size| sed -e 's/[^"]*"//' -e 's/"//'|tail -n 1)
+        DEVSIZE=$(udevadm info --attribute-walk --name=$entry|grep {size}| sed -e 's/[^"]*"//' -e 's/"//'|tail -n 1)
         if [ -z "$DEVSIZE" -o $DEVSIZE -lt 262144 ]; then
             # ignore small devices, that are likely remote media or similar
             continue