* snip.py: Replace github file token with release-specific URL.
* verify.sh: Show the expected output as well as the actual output.
* snip.py: Update the githubfile regex to not include email addresses.
When generating snip scripts, pairs of "@" signs indicate a link to
GitHub repo content. However, JWT attribute values contained pairs of
email addresses such as:
`testing@secure.istio.io/testing@secure.istio.io`
which would be treated as an email address and mangled. This commit
rewrites the regex to not match on email addresses.
* Add authz-jwt user guide test.
Reverted the actual mirror test script, because mirror test seems to have some subtle failure when running with what seems to be the exact same commands via snips. Will investigate further in followup PR. Merging this one to get the generator changes.