Fix demo by removing certs first

demo/clean.sh

@@ -3,4 +3,6 @@
 for b in $(sudo ip l | grep -Po 'NETNS\w\w[\d\-a-f]+'); do sudo ip l del $b; done
 pkill screen
 killall python
-killall python3
\ No newline at end of file
+killall python3
+find . -name '*.db' -delete
+find . -name '*.crt' -delete