AdcNetServiceASIOBase: delete move constructor (asio::streambuf is not

movable), acceptor_t.asyncAccept completion token has signature:
void(std::error_code, std::shared_ptr<netservice_t>)

common/adc_traits.h

@@ -133,6 +133,10 @@ template <typename F>
 struct adc_func_traits<F&> : adc_func_traits<F> {
 };
 
+template <typename F>
+struct adc_func_traits<const F&> : adc_func_traits<F> {
+};
+
 template <typename F>
 struct adc_func_traits<F&&> : adc_func_traits<F> {
 };