pydev_saved_modules: clone first-level module content

[rohanjoyce]

Some functions provided by the modules exposed in pydev_saved_modules are used internally by pydev and can cause problems if a target mocks them out. For each module provided _pydev_imps._pydev_saved_modules, this patch naively creates an new module, then assigns all attributes from the module it's meant to be a clone of, then attaches that module to the expected name.

This was motivated by a mock of 'time.sleep' causing pydev to continually escalate memory usage (even when stopped at a breakpoint). The underlying cause seemed to be the time.sleep in _do_wait_suspend - it was calling the mock, spinning pretty fast and creating a record per-call.