backport apache#12056: set log4j2.is.webapp to false if not set #65
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Backport apache#12056
This PR makes shutdown hooks work again by automatically setting this to false if it is not explicitly set in system properties (similar to the shutdown hook properties themselves). I don't think this should have any impact on Druid since we are not technically a web app, and this setting only appears to be used by a few jmx related settings.