Changeset 9688:349fa0e3e253
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base: Make the Python module loader PEP302 compliant

The custom Python loader doesn't comply with PEP302 for two reasons:

 * Previously, we would overwrite old modules on name
   conflicts. PEP302 explicitly states that: "If there is an existing
   module object named 'fullname' in sys.modules, the loader must use
   that existing module".

 * The "__package__" attribute wasn't set. PEP302: "The __package__
   attribute must be set."

This changeset addresses both of these issues.

Quick regressions pass (with the exception of 02.insttest and 40.m5threads-test-atomic where I can't find the binaries) for all supported architectures.