Use human-readable SSL certificate info in 'svn auth'.

* build.conf: Remove dependency of 'svn' on serf.

* subversion/svn/auth-cmd.c
  (SVN_AUTH_PRETTY_PRINT_SSL_CERTS,
   svnauth__cert_info_keys, cert_info_key_map, show_cert_info,
   split_ascii_cert, load_cert, show_ascii_cert, match_cert_info,
   match_ascii_cert): Remove all of this code related to parsing
    SSL certificates with serf.
  (match_credential): Don't match base64-encoded ascii certs. Certs are
   matched based on their human-readable info, if available.
  (list_credential): Display human-readable SSL cert information.
   Don't bother displaying base64-encoded cert data.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1573693 13f79535-47bb-0310-9956-ffa450edef68