Make it harder to misconfigure logging.threshold.console in yaml about spring-boot

[mhalbritter]

Ah! It's a YAML thing.

logging.threshold.console: off

doesn't work.

logging.threshold.console: "off"

works.

YAML translates off to false, so make sure to quote it.

[philwebb]

I think we might be able to do more to protect against this. Perhaps we can automatically convert false to off

[mhalbritter]

Hey, thanks for the report, but I can't reproduce this. If you'd like us to spend some time investigating, please take the time to provide a complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem.