[#583][Delta] Ensure resources are properly sent again if envoy unsubscribes then subscribes again to a resource #7
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This PR is part of the fix for envoyproxy#583 related to resources being unsubscribed from then subscribed to again
This one applies to both simple and linear cache when using the delta protocol.
Actionable cases would likely only impact delta-ADS as EDS outside of ADS does not share streams and will therefore usually not have multiple resources this way
The logger issue is related to sotw-ADS which is part of a followup PR
This PR is built on top of envoyproxy#584 as the sotw part will be heavily relying on it