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endpointCnt is a refcounter used to track how many endpoints use a network, and how many networks references a config-only network. It's stored separately from the network. This is only used to determine if a network can be removed. This commit removes the `endpointCnt` struct and all its references. The refcounter is replaced by two lookups in the newly introduced `networks` and `endpoints` caches added to the `Controller`. Signed-off-by: Albin Kerouanton <albinker@gmail.com>