Invoke Python function in a directory rather than a zip package
There is a limitation for loading modules directly from a zip file:
"ZIP import of dynamic modules (.pyd, .so) is disallowed." which
makes most of python libs including C extentions not work. So we have
to extract the zip before executing the function.
Change-Id: I4d4eed380a4140c905603891e1dfa942834bd25d