Switch to old hash syntax
Switch to old hash syntax

When executed in cookbooks, we get:

```
STDERR: ./bin/system_info:30: odd number list for Hash
@json_out = {system_info: {}}
                         ^
./bin/system_info:30: syntax error, unexpected ':', expecting '}'
@json_out = {system_info: {}}
                         ^
```

travis-ci/system_info,travis-ci/system-info,travis-ci/system-info,aprescott/travis-system_info,travis-ci/system_info