init influxdb2 support

[BCNelson]

This is the Initial support for version 2 of the influxdb protocol. it is mostly useful for remote instances of influxdb that need to be on version 2.

[BCNelson]

@David00 Just looking for your thoughts on things that need to be changed

[David00]

Hi BCNelson, thanks for putting this together! I haven't tested it yet, but after reviewing it, the only thing I would want to have changed is the default DB version to 1 in config.py. This is mainly so that I don't have to go redo my documentation and test all the dashboards.

I was not familiar with #!/usr/bin/env instead of #!/usr/bin/python but I found this info which provided some interesting context. It shouldn't make a difference in my project as users should be launching it with python3 power-monitor.py but it was interesting to learn about, so thanks! I could even do away with the shebang altogether, actually.

Are there any benefits that moving to Influx 2.0 would bring my project? I understand they're moving to their Flux query language in 2.0 but I haven't used it.

[BCNelson]

@David00 Leaving out the version number is the same as setting it to version 1. I believe that is even better backwards compatibility.

[BCNelson]

As far as I can tell there are not many benefits to version 2 of influxdb. I'm not an influxdb expert by any means. My motivation was to be able to use a central db server and one of my other services needed v2.

[luisfocosta]

Works like a charm! Thanks
One central InfluxDB to rule them all
I rather prefer the version 2 interface and data exploration GUI

[kizniche]

A drawback to influxdb 2 is it drops 32-bit arm support, so it won't work on <= Pi 3

[BCNelson]

@kizniche this is just the influx client witch does support 32bit arm. It is just a http api. I don't think that there is a need to have the influxdb 2 server on the pi as I did this to have a central influx server.

[kizniche]

I exclusively use the influxdb server on Raspberry Pis. I'm just mentioning it because it's an important point to consider for the software component of hardware designed for a Raspberry Pi, since it would be excluding support for the vast majority of Pis that currently exist.

Edit: if this is only expanding the ability to use influxdb2 in addition to influxdb1, then that sounds like a good addition. I just wanted to mention the current need for influxdb1 for most Pis. It appears to be a misunderstanding on my part that this PR may have affected the ability to use influxdb1.