Add test for syslinux converter

tests/syslinux/ubuntu10.04/isolinux/gfxboot.cfg

@@ -0,0 +1,12 @@
+foreground=0xFFFFFF
+background=0x958490
+screen-colour=0x270A1E
+hidden-timeout=2
+label normal=Normal
+append normal=
+label driverupdates=Use driver update disc
+append driverupdates=debian-installer/driver-update=true
+applies driverupdates=live live-install
+label oem=OEM install (for manufacturers)
+append oem=oem-config/enable=true
+applies oem=live live-install install