Update to InfluxDB 2

[biva]

The latest version of InfluxDB (v2) is a major upgrade, for some reasons shared in #45, I'm trying to update the Yunohost package. Unfortunately, my lack of skills is blocking me.

Would anybody here be able to support me? I have created 2 PR:

• Update influxdb to v2 (influxdb2) #45
• Update install to include influxdb2 #46

Thanks for your great work and your support!