Implement quic_tls_secrets_keys_alloc()/quic_tls_secrets_keys_free() to allocate the memory for only one direction (RX or TX). Modify ha_quic_set_encryption_secrets() to call these functions for one of this direction (or both). So, for now on we can rely on the value of the secret keys to know if it was derived. Remove QUIC_FL_TLS_SECRETS_SET flag which is no more useful. Consequently, the secrets are dumped by the traces only if derived. Must be backported to 2.6. (cherry picked from commit e1a49cfd4dc58b1923e99931dd507d2945e5ec8e) Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>