libtest::Server *build_memcached_socket(const std::string& socket_file, const in_port_t try_port);
libtest::Server *build_memcached_sasl(const std::string& hostname, const in_port_t try_port, const std::string& username, const std::string& password);
libtest::Server *build_memcached_socket(const std::string& socket_file, const in_port_t try_port);
libtest::Server *build_memcached_sasl(const std::string& hostname, const in_port_t try_port, const std::string& username, const std::string& password);