[PATCH][WIP] Fix talloc string handling in PIDL-python and so samba-tool demote

[Andrew Bartlett]

I was pulling my hair out (figurtivly) trying to work out why our
'samba-tool domain demote' failed, until I realised our PIDL-generated
python code kept references to string values that had gone out of
scope, and so had been re-used by python.

I need to add a string.py test like the integer.py and array.py we
already have, but here is the patch for comment in the meantime.

Andrew Bartlett
-- 
Andrew Bartlett
https://samba.org/~abartlet/
Authentication Developer, Samba Team         https://samba.org
Samba Development and Support, Catalyst IT   
https://catalyst.net.nz/services/samba





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