demo script updates (#934)

Demo script updates.  Record-replay, a bugfix in the canary demo script, etc.

demos/cncf-webinar/cleanup.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+fission fn delete --name hello
+fission route delete --name $(fission route list|grep hello|cut -f1 -d' ')