test: Better pretty-representation of byte array.
test: Better pretty-representation of byte array.

Reminder: in Go the `byte' type and the `uint8' type are the same thing.
So here whenever we see a `[]uint8', we assume it's a `[]byte' and print
it in a more readable manner.

Change-Id: I58b0b756330fafaa0dca62c4d5b7aec55780ae20

aristanetworks/goarista,aristanetworks/goarista