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Motivation
Fix external memory issue, it turns out it has the same root cause to #4579
Description
Do not set udp to enr so that our node do not have to serve
FIND_NODES
request. This is a work around, the real fix should be in discv5, see this candidate to fix fix: add async await discv5#202External memory has been great for 3 days, on feat1 sm1v: