Add qemu ifup/ifdown scripts

scripts/qemu-custom-ifdown

@@ -0,0 +1,22 @@
+#!/bin/bash
+# This script removes the specified interface if it exists
+
+if [[ $EUID != 0 ]]; then
+	echo "This script needs sudo priveleges"
+	echo "Exiting..."
+	exit 1
+fi
+
+for INT in $(ls /sys/class/net); do
+    if [[ $INT == $1 ]]; then
+        /sbin/ip link delete dev $1 type tap
+        DELETED=true
+        break
+    fi
+done
+
+if [[ !$DELETED ]]; then
+    echo "Interface $1 not found, nothing to delete"
+    exit 1
+fi 
+