This was the first API created for this, it has been superseded
by the API that makes use of era1 files and/or the portal_bridge.
Only usage was still in test_portal_testnet which has now been
altered to make use if API calls from Portal specification.
* Create separate portal rpc handlers for each sub-network.
* Remove random gossip from history and state networks.
* Move shared portal rpc endpoints into common handler.
* Use enum instead of network string.