[#2799] enh: warn if realm authentication fails

[lprimak]

Enhancement.

Warn if realm authentication fails due to system exceptions in m in multi-realm environment, and send an event

• Added EventBus reference to AbstractAuthenticator and made it EventBusAware

• Same for AuthenticationStrategy

• Added AuthenticationExceptionEvent event that is published to EventBus

• Added isWarnIfAuthenticatorFailed flag to AtLeastOneSuccessfulStrategy

• Warn if authentication fails due to system exception in multi-realm scenario, don't swallow the exception

• Send the AuthenticationExceptionEvent to event bus if that happens

• A chore to update Payara settings (will be rebased-and-merged so a separate commit)

fixes #2799

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[steinarb]

LGTM! 👍

(and so I learned about the existence of EventBus)