pyzfs: python3 support (unit tests)

* Updated unit tests to be compatbile with python 2 or 3.  In most
  cases all that was required was to add the 'b' prefix to existing
  strings to convert them to type bytes for python 3 compatibility.

* There were several places where the python version need to be
  checked to remain compatible with pythong 2 and 3.  Some one
  more seasoned with Python may be able to find a way to rewrite
  these statements in a compatible fashion.

Reviewed-by: John Ramsden <[email protected]>
Reviewed-by: Neal Gompa <[email protected]>
Reviewed-by: loli10K <[email protected]>
Signed-off-by: John Wren Kennedy <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #8096

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