Fix jinja 'failed' filter missing & hplip expect script; merge changes from many other contribs.

[rivimey]

This is a round-up of changes both from myself and others. I have tried to set the Author of commits not my own but was unable to do more than one actual merge. The SuSE, CentOS support is untested - I don't have any machines set up for that, but it seemed worth merging anyway.