crypto: introduce method for reloading TLS creds

This prevents direct access of the class members by the VNC
display code.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

include/crypto/tlscreds.h

@@ -77,4 +77,17 @@ bool qcrypto_tls_creds_check_endpoint(QCryptoTLSCreds *creds,
  */
 char *qcrypto_tls_creds_get_priority(QCryptoTLSCreds *creds);
 
+
+/**
+ * qcrypto_tls_creds_reload:
+ * @creds: pointer to a TLS credentials object
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Request a reload of the TLS credentials, if supported
+ *
+ * Returns: true on success, false on error or if not supported
+ */
+bool qcrypto_tls_creds_reload(QCryptoTLSCreds *creds,
+                              Error **errp);
+
 #endif /* QCRYPTO_TLSCREDS_H */