Function configure

cpp/src/test_handler.hpp:39–42

using proton::error_condition;

static inline string configure(connection_options& opts, const string& config) {
    istringstream is(config);
    return connect_config::parse(is, opts);
}

// Extra classes to resolve clash of on_error in both messaging_handler and listen_handler
class messaging_handler : public proton::messaging_handler {