Ship subprocess32 and replace subprocess with it in python code (#8658)
* Ship modified python module subprocess32 again subprocess32 is preferred over subprocess according to python documentation. In addition we long ago modified the code to use vfork() against fork() to avoid some "Cannot allocate memory" kind of error (false alarm though - memory is actually sufficient) on gpdb product environment that is usually with memory overcommit disabled. And we compiled and shipped it also but later it was just compiled but not shipped somehow due to makefile change (maybe a regression). Let's ship it again. * Replace subprocess with our own subprocess32 in python code. Cherry-picked 9c4a885b and da724e8d and a8090c13 and 4354f28c
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