* automated test - insecure remote access to telemetry addons
* Change profile to demo and add snippets to clean up DestinationRule (besides Gateway and VirtualService)
* automated doc test = secure remote access to telemetry addons through gateway
* Automated test for secure access of common telemetry addons and factor out common snippets to test_utils.sh
* moved test_utils to tests/util/addons.sh so that it can be reused across tests
* refactor addons with a more flexible deploy/undeploy function and fix naming of functions to access addons
* fix cleanup after tests
* fix sourcing
* remove verification for istio config deployment
* don't assume the existence of load-balancer in CI environment, but use _set_ingress_environment_variables instead of snippet in the documentation page
* add verification steps back
* fix output snippets and add verifications
Suchith J N