[PR PATCH] Python 3 porting

[github at samba.org]

There is a new pull request by catalyst-joe-guo against master on the Samba Samba Github repository

https://github.com/catalyst-joe-guo/samba enable-py3-via-selftest
https://github.com/samba-team/samba/pull/156

Python 3 porting
This PR is based on @noelpower 's work: #152 , which port the c modules used by Python.
I then enable `py3_compatible` for tests in selftest one by one.

A patch file from https://github.com/samba-team/samba/pull/156.patch is attached
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