* subversion/include/svn_auth.h,
* subversion/libsvn_subr/auth.c,
* subversion/libsvn_subr/simple_providers.c
  Leave a bunch of FIXME comments for another day.  I need to think
  more about how to truly legitimize this whole
  svn_auth_cleanup_walk() API and call tree.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1465119 13f79535-47bb-0310-9956-ffa450edef68