If we have a Varlink interface that allows man subscribers to the same source of events we typically want to notify all of them at once with the same message. Let's add some helpers for this purpose: varlink_many_*() can be used to send messages, similar to the corresponding varlink_*() calls, but they take a Set of Varlink objects and we issue the operation on every connection once. This ports over one existing case where this is beneficial, but the main user for this is supposed to be importd later.
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