Remove unit tests that rely on relays (they are gone now) · neilalexander/harmony@92439c5

func `createTransaction` is unused (unused)

printf: non-constant format string in call to fmt.Errorf (govet)

printf: non-constant format string in call to fmt.Errorf (govet)

printf: non-constant format string in call to (*testing.common).Errorf (govet)

printf: non-constant format string in call to (*testing.common).Errorf (govet)

printf: non-constant format string in call to (*testing.common).Errorf (govet)

SA4003: every value of type byte is <= math.MaxUint8 (staticcheck)

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