On the svn-auth-x590 branch, start showing cert info with the new x509 parser.
This is prelimenary, the parser API still needs changes (e.g. it should return
something like an apr_hash_t instead of the custom x509 struct).

* subversion/libsvn_subr/x509.h
  (x509parse_dn_gets): Declare.

* subversion/libsvn_subr/x509parse.c
  (svn_x509_parse_cert): Set output paramter before returning.
  (x509parse_dn_gets): Temporarlity restore this function from tropicssl.
   This will be replaced soon (and not only because this code is using
   snprintf() unsafely).

* subversion/svn/auth-cmd.c
  (show_cert): New helper function which shows information obtained
   from a PEM cert (base64-encoded), as stored in the auth cache.
  (list_credential): Use show_cert(). Disable code showing cert info
   stored in the config hash.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/svn-auth-x509@1603910 13f79535-47bb-0310-9956-ffa450edef68