ZTS: Eliminate functions named 'random'

The name overlaps with a command needed by FreeBSD.
There is also no sense having two 'random' functions that do nearly
the same thing, so consolidate to just the more general one and name
it 'random_int_between'.

Reviewed-by: John Kennedy <[email protected]>
Reviewed-by: Kjeld Schouten <[email protected]>
Reviewed-by: Igor Kozhukhov <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Ryan Moeller <[email protected]>
Closes #9820 

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