Patch gossipsub (#1490)

## Issue Addressed Some nodes not following head, high CPU usage and HTTP API delays ## Proposed Changes Patches gossipsub. Gossipsub was using an `lru_time_cache` to check for duplicates. This contained an `O(N)` lookup for every gossipsub message to update the time cache. This was causing high cpu usage and blocking network threads. This PR introduces a custom cache without `O(N)` inserts. This also adds built in safety mechanisms to prevent gossipsub from excessively retrying connections upon failure. A maximum limit is set after which we disconnect from the node from too many failed substream connections.
sigp · Aug 8, 2020 · 04e4389 · 04e4389
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commit 04e4389
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/beacon_node/eth2_libp2p/Cargo.toml b/beacon_node/eth2_libp2p/Cargo.toml
@@ -41,7 +41,7 @@ rand = "0.7.3"
 [dependencies.libp2p]
 #version = "0.23.0"
 git = "https://github.com/sigp/rust-libp2p"
-rev = "5139ec3ace4ad52506f217d790f0a9425274caef"
+rev = "3096cb6b89b2883a79ce5ffcb03d41778a09b695"
 default-features = false
 features = ["websocket", "identify", "mplex", "yamux", "noise", "gossipsub", "dns", "tcp-tokio"]