Format software instance JSON
Introduce a simple tool to format JSON for software instance definitions.
This tool is inspired by python -m json.tool, but has the following differences:
- keep the order of keys instead of sorting alphabetically (because we sometimes put the most important options at the top)
 - indent with 2 spaces
 
Run the tool on all the repository and commit the changes, with this command:
for x in $(find . -name '*.json') ; do  echo $x; ./format-json $x $x; done