Consolidate test doubles

- Migrate various mocks of core namespaces to shared version in `fakes` pkg
- Err on the side of making test doubles less sophisticated
- Don't pull over mocks of namespaces that are only used in example code

cmd/erc20.go

@@ -15,18 +15,20 @@
 package cmd
 
 import (
+	"log"
+	"time"
+
 	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/spf13/cobra"
+
 	"github.com/vulcanize/vulcanizedb/examples/erc20_watcher/every_block"
 	"github.com/vulcanize/vulcanizedb/libraries/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
 	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	rpc2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
+	vRpc "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
 	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
-	"log"
-	"time"
 )
 
 // erc20Cmd represents the erc20 command
@@ -54,15 +56,15 @@ Expects an ethereum node to be running and requires a .toml config file:
 func watchERC20s() {
 	ticker := time.NewTicker(5 * time.Second)
 	defer ticker.Stop()
-	rpcClient, err := rpc.Dial(ipc)
+	rawRpcClient, err := rpc.Dial(ipc)
 	if err != nil {
 		log.Fatal(err)
 	}
-	ethClient := ethclient.NewClient(rpcClient)
-	client := client.NewClient(ethClient)
-	clientWrapper := node.ClientWrapper{ContextCaller: rpcClient, IPCPath: ipc}
-	node := node.MakeNode(clientWrapper)
-	transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
+	rpcClient := client.NewRpcClient(rawRpcClient, ipc)
+	ethClient := ethclient.NewClient(rawRpcClient)
+	client := client.NewEthClient(ethClient)
+	node := node.MakeNode(rpcClient)
+	transactionConverter := vRpc.NewRpcTransactionConverter(ethClient)
 	blockChain := geth.NewBlockChain(client, node, transactionConverter)
 	db, err := postgres.NewDB(databaseConfig, blockChain.Node())
 	if err != nil {