Golang 1.13 introduced a change in test flag parsing:
> testing
> ...
> Testing flags are now registered in the new Init function, which is invoked by the generated main function for the test. As a result, testing flags are now only registered when running a test binary, and packages that call flag.Parse during package initialization may cause tests to fail.
https://golang.org/doc/go1.13#testing
Here, we ensure that e2e framework parsing occur in TestMain, by only
initializing Framework at Run invocation.
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