tutorial/motorctrl: reduce logging, change webtalk port number

on the bb writing lots of log to the SD disk causes erratic HAL
behavior, and the gladevcp component shows 'hunting' in the position

The port number 8080 is not a good choice - an apache2 default install
will use it, leading to a collision
Squashed 'src/machinetalk/proto/' content from commit 119379a

git-subtree-dir: src/machinetalk/proto
git-subtree-split: 119379a9be47d3f5d33a9b895d5e767dfc6eff58
Merge commit '638a10966883745028f5ab2ca0c2bc8b9f1137f2' as 'src/machinetalk/proto'