staging: usbip: userspace: usbipd: major cleanup of daemon

Reorganize, rename [for clarity and to remove stub_driver
references], modify output messages, and cleanup coding style;
nevertheless, the actual implementation is pretty much untouched.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>