Some fixes: zWave device integration and BinaryDeviceFeature component

[sescandell]

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Description of change

This PR initially was intended to fix the Device.setValue call for zWave devices. But, making tests with a real BinarySwitch device I identified another issue with the BinarySwitch front component and the Gateway forwarder.

Changes:

• Add the zWaveManager instance as the device property of zwave service (following the PhilipsHueService and its handler scheme)
• An error on device feature test about setValue feedback
• BinaryDeviceFeature: a mix between bool and int making impossible to Switch On then Switch Off the device
• Do not try to Forward messages to the Gateway when not connected to it

[codecov]

Codecov Report

Merging #608 into master will decrease coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #608      +/-   ##
==========================================
- Coverage   91.92%   91.83%   -0.09%     
==========================================
  Files         399      400       +1     
  Lines        4865     4876      +11     
==========================================
+ Hits         4472     4478       +6     
- Misses        393      398       +5

Flag	Coverage Δ
#server	91.83% <100%> (-0.09%)	⬇️

Impacted Files	Coverage Δ
server/services/zwave/index.js	93.33% <ø> (ø)	⬆️
server/lib/gateway/gateway.forwardWebsockets.js	75% <100%> (-13.89%)	⬇️
server/services/zwave/lib/index.js	100% <100%> (ø)	⬆️
server/lib/device/device.setValue.js	100% <100%> (ø)	⬆️
...rver/services/zwave/lib/commands/zwave.setValue.js	50% <0%> (ø)

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[Pierre-Gilles]

Thanks for this great PR, tested on merged! 👍 👏