This used to be the case on Python 2.  Commit
212b590e changed the implementation for Python
3, making the `log()` method of LogAdapter call `logger._log()` directly.  This
makes nested log adapters not execute their ``process()`` method.  This patch
fixes the issue.

Also, now proxying `name`, too, to make `repr()` work with nested log adapters.

New tests added.
(cherry picked from commit ce9e6254)
Co-authored-by: Łukasz Langa <lukasz@langa.pl>