Comment 2 for bug 1794952

I think this is a duplicate of https://bugs.launchpad.net/tripleo/+bug/1792872 - the hesitation is because the traces are slightly different in the various examples (see description above and comment #3 at bug/1792872 for examples) however in all cases the error is happening during the Ironic introspection during the overcloud-prep-images.sh and is coming from mistral. Will add more info in the other bug for now thanks.