type_to_parent seems to be a less complete implementation of py_scalar_parent.

The change on this ticket helps get rid some explicit imports from sage.rings.

CC: @tscrim @mezzarobba

Component: refactoring

Author: Matthias Koeppe

Branch/Commit: 4b37cc6

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/29880