add ActorRefProvider.getDefaultAddress
The recent change made as per #2657 introduced a semantic change to publish the default address as
ExtendedActorSystem.provider.rootPath.address
. The reason for having this information exposed—required by consistent hashing router—is still valid, so replace it with exposing a ActorRefProvider.getDefaultAddress method. Changes to how rootPath works might have undesired side-effects.
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