This sorts a array of Net::Connection objects.

Currently the methods below are supported.

 * host_f - Host foreign
 * host_fl - Host, foreign then local
 * host_l - Host, local
 * host_lf - Host, local then foreign
 * pid - Process ID
 * port_f - Port, foreign, numeric
 * port_fa - Port, foreign, alpha
 * port_l - Port, local, numeric
 * port_la - Port, local, alpha
 * proto - Network connection protocol
 * ptr_f - PTR, foreign
 * ptr_l - PTR, local
 * state - Connection
 * uid - User ID
 * user - Username