[OE-core] Changes to Image Definitions in 1.7.1

[Walter Giroir]

I am in the process of moving from Yocto 1.5.1 to 1.7.1.

Overall the process has gone very smooth but I have one blocking issue.

I have a layer with an Image defined in new_layer/classes/new_image.bblcass

When running with 1.5.1, it works fine.
When running with 1.7.1, it does not even parse the file

Has anyone encountered this or is there a description of the changes in this area.

Thanks in advance,
—Walt