Make authz and password config file readers in svnserve only depend on
repository information.  Defer error logging to the caller level that
will have a server baton.

* subversion/svnserve/server.h
  (load_pwdb_config): remove from header

* subversion/svnserve/serve.c
  (load_pwdb_config,
   load_authz_config): restrict parameters to repository-specific ones;
                       defer error logging to parent
  (handle_config_error): new utility for deferred error logging
  (find_repos): update and simplify caller
  (serve): handle deferred error logging

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1529748 13f79535-47bb-0310-9956-ffa450edef68