mod_pubsub_serverinfo: Fix check for local domain The module was checking whether a host exists, but this may be misleading if our host is loaded before the host that is being checked. This change makes it check the config. This will provide a false positive in the rare case that the host is defined but not activated/enabled. But we don't have an API currently for "is this host configured and enabled?"

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labels:
- Stage-Alpha
summary: "XEP-0397: Instant Stream Resumption"
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Experimental and incomplete implementation of [XEP-0397: Instant Stream Resumption].