* add group to sensor initial discovery and use dynamic_discovery_get_value template syntax on them
* spaces
* switching to YamlDiscovery::replaceValues
* testdata from ibmc
* testdata from nxos
* testdata from omnitron-iconverter
* testdata from vrp
* adapt discovery_schema to accept variables
* remove pattern
* Update discovery_schema.json
Improves visual identification for sensors
- [x] Docs
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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.
WIP - @papatango71 please test.
