Require it explicitly. Makes it easier to understand and matches the style of other values
Questionable YAML changes (either broken before or now broken):
secureplatform: haStatCode
ptp600: receiveModulationMode
DO NOT DELETE THIS TEXT
#### Please note
> Please read this information carefully. You can run `./scripts/pre-commit.php` to check your code before submitting.
- [x] Have you followed our [code guidelines?](http://docs.librenms.org/Developing/Code-Guidelines/)
#### Testers
If you would like to test this pull request then please run: `./scripts/github-apply <pr_id>`, i.e `./scripts/github-apply 5926`
After you are done testing, you can remove the changes with `./scripts/github-remove`. If there are schema changes, you can ask on discord how to revert.
* Added Arris C3 to cmts.yaml
* Added Arris C3 hardware
* ARRIS CMTS->Move from cmts to arris_c4 yaml
* Fixed some Arris_c4 definitions
* Added Arris C3 CMTS
* Fixed some typos
* Arris C3 test files
* Arris C4 test files
* Deleted not anymore valid files
* Renamed from underscore
* Fixed some typos
* Correct test files
* Removed old snmprec files
* Correct test files v2
* Deleted more old files
* Return to cmts for valid_sensor() for Arris C4/C4c
* Re-done test files
* Re-do test files after rebase
