hi,

xen/utils/blkif.py imported log from xen.xend.XendLogging but never uses.

Other tools rather than xend can easily get the block device id by calling
blkdev_name_to_number(). So it's useful to other tools.

But the dependency on XendLogging prevents it from directly resuing.

This patch removes the dependency on XendLogging from xen/utils/blkif.py.

thanks,

zhigang