[issue6508] expose setresuid

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Attaching an updated patch that includes unittests.

I also changed the set functions to take input as long's instead of int's 
as that is more likely to fit within a uid_t and forced the return values 
on the get's to fit within a long and used Py_BuildValue() to handle 
memory errors and such that could happen while allocating the ints and 
tuple rather than PyTuple_Pack.

Remaining work: os module documentation.

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Added file: http://bugs.python.org/file15297/issue6508-gps01.diff

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