add vlan to instance

diff --git a/gnt-vlan.sh b/gnt-vlan.sh
new file mode 100755 (executable)
index 0000000..cabbc99
--- /dev/null
+++ b/gnt-vlan.sh
@@ -0,0 +1,2 @@
+#!/bin/sh -xe
+gnt-instance modify --net add:link=$1 $2