* refactor zipkin doc test to use test/util/addons.sh
* doc test for accessing jaeger dashboard
* doc test for accessing istio-mesh and istio-service dashboards in grafana by port-forwarding
* add -L flags to follow redirects for accessing dashboards
* fix linting issue - double quote around ingress gateway URL
* improve Grafana and Jaeger access tests based on code review feedback
* fix jaeger url
* remove prometheus queries through grafana to check if it is causing flakes in CI
* fix grafana test to use productpage request boilerplate
* fix formatting in Makefile.overrides.mk
* 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
Eric Van Norman