Bump Clonezilla to 2.4.7-8

src/utils.ipxe

@@ -31,8 +31,9 @@ set util_file avg_arl_cdi_all_120_150814a10442.iso
 goto boot_memdisk
 
 :clonezilla
-set util_path sourceforge.net/projects/clonezilla/files/clonezilla_live_stable/2.4.6-25/clonezilla-live-2.4.6-25-amd64.iso/download
-set util_file clonezilla-live-2.4.6-25-amd64.iso
+set clonezilla_version 2.4.7-8
+set util_path sourceforge.net/projects/clonezilla/files/clonezilla_live_stable/${clonezilla_version}/clonezilla-live-${clonezilla_version}-amd64.iso/download
+set util_file clonezilla-live-${clonezilla_version}-amd64.iso
 goto boot_memdisk
 
 :dban