Update networking code to libp2p 0.14 (#4383)

* Entirely update substrate-telemetry to futures 0.3

* Add a Closed error

* Update to libp2p 0.14

* More work

* More work

* More work

* More work

* Fix warnings

* Remove unwrap()

* Work on tests fixing

* Fix network tests

* Fix external network tests

* Update libp2p and restore Yamux in discovery test

* Ignore DNS if initializatio nfails

* Restore variables ordering

* Forgot browser-utils

* Fix downfall after merge

* Fix tests