xl: Change default global config not to contain uncommented default

[mistakenly applied v4 of patch 7/12 rather than v4b -iwj]

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/examples/xl.conf

@@ -2,4 +2,4 @@
 
 # automatically balloon down dom0 when xen doesn't have enough free
 # memory to create a domain
-autoballon=1
+#autoballon=1