gnutls_pkcs11_token_set_pin - API function
int gnutls_pkcs11_token_set_pin(const char * token_url, const char * oldpin, const char * newpin, unsigned int flags);
This function will modify or set a user or administrator's PIN for the given token. If it is called to set a PIN for first time the oldpin must be NULL. When setting the admin's PIN with the GNUTLS_PIN_SO flag, the oldpin value must be provided (this requirement is relaxed after GnuTLS 3.6.5 since which the PIN will be requested if missing).
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.
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