1. refactors basic workflow (move code to common)
2. use different namespace accross test runs to isolate
3. include wait logic in CreateNamespace to allow multiple runs
4. include wait logic in DeleteNamespace to allow multiple runs
This is important since we need more integration tests and some of
these changes should allow `./test/e2e-tests-local.sh` to run on
local clusters (minikube or something other than test-infra) and
correctly behave during mutiple runs.
1. creates a namespace 'kne2etests' (default name, change with env KN_E2E_NAMESPACE)
2. executes kn commands as per Basic workflow doc in said namespace
3. verifies each command's output
4. deletes the 'kne2etests' namespace
dr.max