tempo: Clean up config a bit

Partially supersedes !866 (merged) (will do the rest of that in follow-ups).

Miscellaneous fixes, see individual commits. :)

requested review from @klausenbusk and @gromit

assigned to @svenstaro

changed title from tempo: disable usage report to avoid tempo phoning home to tempo: Clean up config a bit

changed the description

changed the description

approved this merge request

mentioned in commit ad860ccc

merged manually

added statusdeployed label

changed the description