fix tarfile crypto parameter passing

fix tarfile crypto parameter passing

Remove obsolete parameters like “password” that are no longer
meaningful after moving the creation of the crypto context
outside of tarfile.py.

Also, check test the presence of encryption attributes before
accessing them to avoid conflicts with zlib streams. (Kludgy, but
not avoidable without a larger changes due to the possibility of
“fileobj” being anything, including things that don’t satisfy all
the interfaces that “_Stream” provides.