The new 'configureEnvironment(:Environment) method attempts to add a custom PropertySource to the Environment if the Environment is configurable, otherwise proceeds in setting a Java System Property as before.
The idea is, the Environment is more recycable than Java System Properties, particularly if the Spring ApplicationContext is refreshed.
Renames DEFAULT_CLUSTER_CONDITION_MATCH to DEFAULT_CLUSTER_AWARE_CONDITION_MATCH.
Renames DEFAULT_CLUSTER_CONDITION_STRICT_MATCH to DEFAULT_CLUSTER_AWARE_CONDITION_STRICT_MATCH.
ee242bece8