Make the following improvements to functional and e2e tests:

• All tests can be run directly using `go test` using all the normal mechanisms for selecting tests to run (make still has convenience targets) e.g.:
  • go test tests/e2e/logforwarding/....
  • cd tests/e22/logforwarding/fluent; go test -run "simple"
• Each individual test establishes its own requirements, with the following assumptions:
  • Assume the operator is deployed, do not undeploy or re-deploy it.
  • Assume some other test may have previously have started and failed, and left side-effects behind in namespace/openshift-logging.
  • Force cleanup and re-establish any state required in namespace/openshift-logging, e.g. CL, CLF, collector deployments etc.
  • Create all other resources in a private, uniquely-named namespace

Additional cleanup of tests:

• Use common test client framework (test/client, test/runtime)
• Eliminate redundant code and overlaps in test/e2e framework
• Eliminate or combine overlapping tests where possible without losing coverage.