[config] add seeds to fullnode config

Closes: aptos-labs#235

config/src/config/test_data/public_full_node.yaml

@@ -19,11 +19,11 @@ full_node_networks:
       # prevent remote, incoming connections.
       listen_address: "/ip4/127.0.0.1/tcp/6180"
       network_id: "public"
+      # Define the upstream peers to connect to
+      seeds:
+        {}
 
-json_rpc:
-    # This specifies your JSON-RPC endpoint. This runs locally to prevent remote queries, setting
-    # it to 0.0.0.0:8080 would open it to all remote connections that can connect to that computer.
-    address: 127.0.0.1:8080
 
 api:
     enabled: true
+    address: 127.0.0.1:8080

docker/compose/public_full_node/public_full_node.yaml

@@ -18,6 +18,9 @@ full_node_networks:
       # The network must have a listen address to specify protocols. This runs it locally to
       # prevent remote, incoming connections.
       listen_address: "/ip4/127.0.0.1/tcp/6180"
+      # Define the upstream peers to connect to
+      seeds:
+        {}
 
 api:
     # This specifies your REST API endpoint. Intentionally on public so that Docker can export it.