UTIL: Remove python wrapper sss_python_unicode_from_string The function PyUnicode_FromString is available in python >= 2.6 Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>

UTIL: Remove python wrapper sss_python_set_check The macro PySet_Check is defined in python >= 2.6 Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>

UTIL: Remove python wrapper sss_python_set_add The function PySet_Add is available in python >= 2.6 Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>

UTIL: Remove python wrapper sss_python_set_new The function PySet_New is available in python >= 2.6 Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>

Fix python HBAC bindings for python <= 2.4 Several parts of the HBAC python bindings did not work with old Python versions, such as the one shipped in RHEL5. The changes include: * a compatibility wrapper around python set object * PyModule_AddIntMacro compat macro * Py_ssize_t compat definition * Do not use PyUnicode_FromFormat * several function prototypes and structures used to have "char arguments where they have "const char *" in recent versions. This caused compilation warnings this patch mitigates by using the discard_const hack on python 2.4