Remove network lock (#840)

* Initial work on removing libp2p lock

* Removes lock from libp2p service

* Completed network lock removal

* Correct network termination future

* Correct fmt issues

* Remove Drop implementation for network service

* Address reviewers suggestions

* Fix dht persistence test (#844)

* Fix persistence test

* Block until dht is persisted

* Fix libp2p test

* Correct test ordering check

* Remove expensive tests from debug testing

Co-authored-by: Pawan Dhananjay <pawandhananjay@gmail.com>

beacon_node/network/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 [dev-dependencies]
 sloggers = "0.3.4"
 genesis = { path = "../genesis" }
+tempdir = "0.3"
 
 [dependencies]
 beacon_chain =  { path = "../beacon_chain" }