block_resize: needs sleep a while when check the disk size after block_resize



Signed-off-by: Cong Li <coli@redhat.com>
Hi ypu,

Thanks for your review.
 
As you suggested that do comparison between current_size and block_size, but it may miss the qemu bugs.
e.g. block_resize failed, the size does not change, or not change to the expected size.

I have a idea about it, but it just fit for linux guest, I don't know how to do for windows guest.
We can check the serial log to make the block_resize operation finished.

If I'm misunderstanding your meaning, feel free to correct me.

Thanks,
Cong