Add qemu ifup/ifdown scripts

scripts/generate-tap

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Generate a numbered tap device name
+
+TAP="tap0"
+COUNT=0
+
+while [[ true ]]; do
+    FOUND=false
+
+    for INT in $(ls /sys/class/net); do
+        if [[ $INT == $TAP ]]; then
+            ((COUNT++))
+
+            TAP="tap$COUNT"
+            FOUND=true
+            continue
+        fi
+    done
+
+    if [[ !$FOUND ]]; then
+        break
+    fi
+done
+