Additional output plugin for writing to OpenTSDB using telnet mode

[rplessl]

Hi,

This additonal output plugin enables to write from telegraf to OpenTSDB using the telnet mode.

My Unit Tests are not 100% code coverage, at the moment I will write a MOC for OpenTSDB emulation which will follows in a second pull request.

I have signed already the CLA

Thanks for pulling in advance!

[sparrc]

please run go fmt on your code, it looks like you have some space-indented lines here

[rplessl]

fixed thanks for the hint

[sparrc]

This is great, thanks much @rplessl! I can tell that you read the contributing guidelines :-) 👍 👍

re: unit tests, I'm not sure how much work it's going to be to mock openTSDB, but have you considered trying out a docker image of openTSDB rather than mocking it? The kafka output sink utilizes that for unit testing and it simplified things enormously.

[rplessl]

thanks for the hint for unit tests- I will also take a docker image

[sparrc]

You can do one or the other....basically would require adding the docker image to the scipts/docker-compose.yml file, then using testutil to get the host that the docker openTSDB is at. That would also make it part of a "long" unit test suite

[rplessl]

Hi @sparrc:
As discussed last week, I have added several unit tests using OpenTSDB a docker image.
Could you pull it?

[sparrc]

thanks @rplessl, I'm going to try to merge this today 👍