util/hbitmap: Add an API to reset all set bits in hbitmap

util/hbitmap: Add an API to reset all set bits in hbitmap

The function bdrv_clear_dirty_bitmap() is updated to use
faster hbitmap_reset_all() call.

Signed-off-by: Wen Congyang <[email protected]>
Signed-off-by: zhanghailiang <[email protected]>
Signed-off-by: Gonglei <[email protected]>
Acked-by: Paolo Bonzini <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Reviewed-by: John Snow <[email protected]>
Message-id: 555E868A[email protected]
Signed-off-by: Stefan Hajnoczi <[email protected]>