refactor: simplify parameters in e2e tests

[maximilien]

Refactor

From PR #765

looking at result of refactoring, every lib util now need to take 3 testing related params, before it actually takes any operation related param, e.g:

func serviceCreate(t *testing.T, it *test.KnTest, r *test.KnRunResultCollector, serviceName string) {
There is repetition,
see:

type KnRunResultCollector struct {
  results    []KnRunResult
  extraDumps []string
  t          *testing.T
}
We can access testing.T from KnRunResultCollector in every test util function, this can be fixed
separately from this PR. @rhuss: WDYT?

/kind good-first-issue
/kind refactor

[maximilien]

cc @navidshaikh @rhuss