demo script updates (#934)

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

demos/declarative-specs/run.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+DEMO_RUN_FAST=1
+ROOT_DIR=$(dirname $0)/..
+. $ROOT_DIR/util.sh
+
+desc "Declaratively specified app"
+run "ls specs"
+
+desc "Generate initial YAML, so we don't have to write it by hand"
+run "fission function create --spec --name hello-go --env go --src hello.go --entrypoint Handler"
+
+desc "Generated function YAML"
+run "tail -25 specs/function-hello-go.yaml"
+
+desc "Deploy on cluster, and wait for build result"
+run "fission spec apply --wait"
+
+desc "Invoke the function"
+run "fission function test --name hello-go"
+
+desc "Live-reload: auto build + deploy on save"
+run "fission spec apply --watch"
+