Z-Wave Improvements

[Pierre-Gilles]

Pull Request check-list

To ensure your Pull Request can be accepted as fast as possible, make sure to review and check all of these items:

• If your changes affects code, did your write the tests?
• Are tests passing? (npm test on both front/server)
• Is the linter passing? (npm run eslint on both front/server)
• Did you run prettier? (npm run prettier on both front/server)
• If your changes modify the API (REST or Node.js), did you modify the API documentation? (Documentation is based on comments in code)
• If you are adding a new features/services which needs explanation, did you modify the user documentation? See the GitHub repo and the website.
• Did you add fake requests data for the demo mode (front/src/config/demo.json) so that the demo website is working without a backend? (if needed) See https://demo.gladysassistant.com.

NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.

Description of change

Please provide a description of the change here. It's always best with screenshots, so don't hesitate to add some!

[codecov]

Codecov Report

Merging #615 into master will increase coverage by 0.05%.
The diff coverage is 90%.

@@            Coverage Diff             @@
##           master     #615      +/-   ##
==========================================
+ Coverage   91.83%   91.89%   +0.05%     
==========================================
  Files         400      404       +4     
  Lines        4876     4936      +60     
==========================================
+ Hits         4478     4536      +58     
- Misses        398      400       +2

Flag	Coverage Δ
#server	91.89% <90%> (+0.05%)	⬆️

Impacted Files	Coverage Δ
server/utils/constants.js	100% <ø> (ø)	⬆️
server/lib/device/device.newStateEvent.js	77.77% <0%> (+7.77%)	⬆️
...erver/services/zwave/lib/events/zwave.nodeAdded.js	100% <100%> (ø)	⬆️
...ver/services/zwave/lib/events/zwave.nodeRemoved.js	100% <100%> (ø)
...rver/services/zwave/lib/commands/zwave.getNodes.js	96% <100%> (+12.66%)	⬆️
server/services/zwave/lib/index.js	100% <100%> (ø)	⬆️
server/services/zwave/lib/utils/getUnit.js	62.5% <62.5%> (ø)
server/services/zwave/lib/constants.js	100% <0%> (ø)
server/services/zwave/lib/utils/getCategory.js	100% <0%> (ø)
... and 1 more

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