Make use of stdout for statement "Ignoring autotools template ..."

I would propose to change this print statement to stdout as this is not an error one would want to fix in my opinion, so it is just an information.

This comes in handy for me as I can now redirect stdout to separate the errors from the informative print statements:

python ./checkers/check_via_appstream.py check ./content/apps 2>&1 >/dev/null