Adding InfluxDB 0.9 Support

[berglh]

I moved to InfluxDB version 0.9 last week and updated this container to work with the new version. I've left the default version as InfluxDB 0.8 for the meantime, as applications like Grafana are still finalising 0.9 support. The plugin for StatsD does have full support for 0.9 now, so I thought it was worth updating this package. The changes I made for this commit are:

• Updated to node:0.12.7-slim container
• Updated to npm plugin statsd-influxdb-backend v0.60 for InfluxDB v0.9 support
• Added generic-pool plugin for node as it was missing in node:0.12.7-slim
• Added git install to Dockerfile as it was not inbuilt in node:0.12.7 slim
• Added evironmental variables to config.js for InfluxDB v0.9 support
• Updated README.md with additional information related to InfluxDB versions and new environment variables

I've tested this container to collect stats and visualise the data with Grafana 2.0.2 using the preliminary InfluxDB v0.9 support. Everything is working correctly.

Do you think it might be worthwhile adding a changelog and git tags to track the version changes? It's pretty simple container so it might not be worthwhile.

[premist]

Hi @berglh, Thank you so much for your pull request! 👍 My apologies for checking this late.
It seems like the latest version of the InfluxDB is 0.9.3. If you can check that this works with the 0.9.3, I'll go ahead and merge this.

[jeremiahsnapp]

I just tested this PR with influxdb 0.9.5 and it works great for me except for the line that sets the ssl value. It needs to look like the following code instead so the final value is a boolean rather than a string.

      ssl: (process.env.INFLUXDB_SSL || "false").toLowerCase() === "true",

[ryanleary]

Can we get this merged in?

[premist]

Hi @berglh, can you confirm that this works on the latest version of InfluxDB? According to @jeremiahsnapp's comment, it seems like some adjustments are needed.

[berglh]

Sorry I missed this notification. It has been working for me for quite sometime, however, I have not tested the SSL functionality of the config as @jeremiahsnapp has pointed out. Our InfluxDB instance is not configure to use SSL, so I would need to do a lot of modification to verify this.