Previously, when neither '--any' nor '--interface' options specified, at least one of the interfaces must be in configured state. This patch makes wait-online exit with success even if all interfaces are in unmanaged state. This may break backward compatibility in a rare situation. But in most cases, this typically not change anything, as at least one interface is managed by networkd.service when it is enabled. This is mostly for making wait-online gracefully handle the case that networkd.service and wait-online.service are enabled by mistake. In such situation, all interfaces are typically not managed. Fixes #25813.
System and Service Manager
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