nbd-client: new applet

nbd-client: new applet

function                                             old     new   delta
nbdclient_main                                         -     537    +537
daemon                                                 -     162    +162
packed_usage                                       27682   27724     +42
applet_names                                        2355    2366     +11
bbconfig_config_bz2                                 4918    4922      +4
applet_main                                         1376    1380      +4
applet_nameofs                                       688     690      +2
applet_install_loc                                   172     173      +1
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 6/0 up/down: 763/0)             Total: 763 bytes

Signed-off-by: Rob Landley <rob@landley.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>