add_cookie_secret
void add_cookie_secret(struct cookie_secrets* cookie_secrets, uint8_t* secret,
add_cookie_secret(nsd, secret);
void add_cookie_secret(struct nsd* nsd, uint8_t* secret);
add_cookie_secret(cookie_secrets, secret, UNBOUND_COOKIE_SECRET_SIZE);
void add_cookie_secret(struct cookie_secrets* cookie_secrets, uint8_t* secret,