Overview of the changes:
- Adding ability to verify that expected output occurs a number of times consecutively. This is needed for https://github.com/istio/istio.io/pull/8402.
- Moving snapshot checking logic to Go code so that it can be separated out into separate test steps, which are timed and contain their own output directories/files. This makes the code cleaner and also makes the snapshot logic more transparent.
- Updating debug.sh to use newer bash syntax that allows it to dynamically select a free file descriptor. Without this, I was seeing all commands echoed to my console in goland.
Nathan Mittler