* Vallox: Increase robustness on startup
Experiments showed that timing of websocket requests to the Vallox firmware is
critical when fetching new metrics. Tests on different Raspberry Pis and x86
machines showed that those machines with little processing power tend to fail
the timing requirments during the busy startup phase of Home Assistant,
resulting in the Vallox integration failing to set itself up.
This patch catches Websocket's InvalidMessage, which is a symptom of failing the
timing requirements. Experiments again showed that on the Raspberry's, this
exception is catched once at startup, but the integration is running fine
afterwards.
* Update __init__.py
* Bump to new 2.1.0 version of api.
* Bump to api 2.2.0
