ftpd: implement -vv verbosity

function                                             old     new   delta
ftpd_main                                           2097    2190     +93
verbose_log                                            -      33     +33
cmdio_write_raw                                       12      34     +22
cmdio_write_ok                                        25      45     +20
cmdio_write_error                                     25      45     +20
cmdio_write                                           62      78     +16
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(add/remove: 1/0 grow/shrink: 5/0 up/down: 204/0)             Total: 204 bytes

1 file changed