staging: usbip: userspace: update man pages for v1.0.0

This brings them back up to date after:

  commit e9837bbb3e694eef4c55c934ebf1f8a0399b142c
  Author: matt mooney <mfm@muteddisk.com>
  Date:   Thu May 26 06:17:11 2011 -0700

    staging: usbip: userspace tools v1.0.0

I couldn't find a current equivalent for

  client:# usbip --port

Perhaps that functionality has been deprecated due to better logging.
It seems like libsrc/usbip_common.h's usbip_status_string is no longer
used.

Signed-off-by: W. Trevor King <wking@tremily.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>