* test framework enhancement for multicluster doc test
* simplify multicluster test framework with setup=multicluster directive
* restore documentation comment
* run tests with new kind setup script
* kind_provisioner fixup for ipv6 and some refactoring
* simplify setup for multicluster/single-cluster doc test with kind_provisioner
* define environment variables required by provisioner
* sync common files
* Update test framework to use 1.6.0-beta.0
* Go back to copies from env var
* Add more test targets, fix mtls test (new PA added)
* Update to use Istio SHA from go.mod (convert to long SHA)
* Try and remove TAG from prow
* Debug TAG not being set
* Fix paralization issue
* Remove some extra output
* Review comments