[PATCH] samba.registry Python 3 compatible and Python 2.6 fixes

[Lumir Balhar]

Hello.

I ported another Python module, samba.registry, to Python 3 compatible 
form (patch #1) and I improved its test coverage (patch #2).

Everything went well with Python 2.7 and 3.6 but then I found some 
issues during testing the ported module with Python 2.6.6 in VM with 
fresh CentOS 6 installation.
The second two patches contain fixes for Python 2.6.

The first problem I found is in lib/pam_wrapper/python/pypamtest.c where 
function PyErr_NewExceptionWithDoc is used, but this function is 
available only in Python 2.7 and higher. This bug was probably hidden 
because pam_wrapper can be installed as a distribution package. Fixed 
with #if/#else in patch 3.

The second one is in testsuite/unittests/rpc_test_dummy_module.c where I 
get an error about undefined kill() function and SIGKILL constant. I 
don't know where this bug comes from, but including signal.h header file 
fixes it. Fix attached as patch 4.

Thank you and have a nice day.

Lumír

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