add kvm-img wrapper script

diff --git a/blank-kvm-image b/blank-kvm-image
new file mode 100755 (executable)
index 0000000..56c277e
--- /dev/null
+++ b/blank-kvm-image
@@ -0,0 +1,3 @@
+#! /bin/sh
+set -e
+kvm-img create -f qcow2 "$1.img" "${2}M"