Return the Certificate's Subject DN as a gnutls_x509_dn_t data type,
that can be decoded using gnutls_x509_dn_get_rdn_ava().
Note that dn should be treated as constant. Because it points into
the cert object, you should not use dn after cert is deallocated.
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gnutls 3.5.9 gnutls_x509_crt_get_subject(3)