tutorial/motorctrl: reduce logging

on the bb writing lots of log to the SD disk causes erratic HAL
behavior, and the gladevcp component shows 'hunting' in the position
Squashed 'src/machinetalk/proto/' content from commit 119379a

git-subtree-dir: src/machinetalk/proto
git-subtree-split: 119379a9be47d3f5d33a9b895d5e767dfc6eff58
Merge commit 'f1c7986d2b023df199705fdde8e1a37767f4048d' as 'src/machinetalk/proto'