Additional features in shutil.py

[brno32]

My team is finding we're writing a lot of wrapper code that could probably just be handled in shutil.py

For example, if copytree supported remote to local and local to remote operations instead of just remote to remote, this would take care of most of our needs.

Could we add support?

[jborean93]

Sure, shutil is meant to be helpers on top of the core SMB protocols which would include copies on remote <-> local. Just needs someone to add a PR with tests.