Python 2 and 3 compatibility

With Python 2 (slowly) approaching EOL and its removal from distribitions
already being planned (Fedora), the existing Python 2 code needs to be
transitioned to Python 3.  This patch stack updates the Python code to
be compatible with Python 2.7, 3.4, 3.5, 3.6, and 3.7.

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

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