httpd: extend -p PORT to -p [IP[v6]:]PORT

httpd: extend -p PORT to -p [IP[v6]:]PORT
httpd: comment out strange code which "closes connection properly"
(isnt exit(0) good enough?)

handle_incoming_and_exit                               -    2246   +2246
httpd_main                                          1116    1141     +25
getLine                                               75      77      +2
packed_usage                                       22827   22811     -16
parse_conf                                          1303    1284     -19
shutdown                                              32       -     -32
handleIncoming                                      2578       -   -2578
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/2 up/down: 2273/-2645)       Total: -372 bytes
   text    data     bss     dec     hex filename
 774704    1058   11092  786854   c01a6 busybox_old
 774335    1058   11092  786485   c0035 busybox_unstripped