Note: Unregistered services will not disappear form the list of services immediately. According to the specification, when unregistering services we send goodbye packets and then wait 1s before purging the cache.
This is support for shared records that can be rescued by some other cooperation DNS.
Clients receiving a Multicast DNS Response with a TTL of zero SHOULD NOT immediately delete the record from the cache, but instead record a TTL of 1 and then delete the record one second later.@param info service info to remove
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