Restore the iteration behavior, with a comment explaining why.
Restore the iteration behavior, with a comment explaining why.

* subversion/libsvn_ra_serf/auth.c:
  (svn_ra_serf__handle_auth): go back to using serf_bucket_headers_do().

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion