LoggingSystemShutdownListener runs immediately after
BootstrapApplicationListener and contains the code which used to be
in that to clean up the logging system (and make it go dark). That
is still a little bit of a hack to work around some limitations in
the static logging libraries (via the Spring Boot Logging System
and LoggingApplicationListener).
If the LoggingApplicationListener is then *not* applied in the
ContextRefresher, then we don't need the LoggingSystemShutdownListener
either. In fact we can narrow down the ContextRefresher to be only
interested in the listeners that affect the Environment (of which
we know of only 2). It means that any listeners that are added that
affect the Environment will not be applied, but there are plenty of
more "official" channels for modifying the Environment
(EnvironmentPostProcessor and PropertySourceLocator), so users can
easily migrate to a better implementation.
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