Stripe/veneur docker images fail using default configuration with obtuse error about veneur HOT 3 OPEN

Well, the specific issue on 14.1.0's default config is something I've fixed by going through all of the various sink config options (grepping for SpanSinks in code), and I have currently got my instance working by setting a bunch of options to empty string by default. The last one that got it finally working was disabling the various splunk options referenced here (still using stripe/veneur:14.1.0 image)

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I suppose I'm asking for a few things here, and feel free to work on or deny any of them:

• Please update the tag for 14.1.0 to reference the commit used to generate the stripe/veneur:14.1.0 docker image
• Either: note that 14.2.0 is not in a "released" state in the dockerhub page, or say that it's been released in the CHANGELOG.md
• The default config file should load without errors, or the errors should explain what fields need to be configured
• When the config file contains invalid config, it would be awesome if it said what was invalid/missing. At least once, in my case, that error should have been: "Can't load splunk config because..."

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BTW it appears the 14.1.0 tag should probably be referencing the b73d186 commit, which I found by checking the update time of the docker image, and seems to correspond with file/line numbers to the various error messages I was getting

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