Format a slice of bytes as printable string when possible Based on `strconv.IsPrint()`, when the slice is fully made of printable bytes, format it as a string using `formatString()`. Also reverts `format_test.go` to its previous state including printable byte slices.

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Gomega is MIT-Licensed
The ConsistOf matcher uses goraph which is embedded in the source to simplify distribution. goraph has an MIT license.