cmd/swarm: make bzzaccount flag optional and add bzzkeyhex flag (#1531)

* cmd/swarm: don't require bzzaccount flag

* docker: remove setup script because bzzaccount is not required anymore

* cmd/swarm: manage account creation/selection when bzzflag is not defined

* cmd/swarm: no bzzaccount flag tests

* cmd/swarm: use random network ports on tests

* cmd/swarm: fix typo

* cmd/swarm: add --bzzkeyhex flag

* cmd/swarm: use different ipc paths for tests

* readme: update example on how to run swarm

* cmd/swarm: rename getAccount -> getOrCreateAccount

* cmd/swarm: remove unneeded comment

* cmd/swarm: use shorter ipc path for test

cmd/swarm/config.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"crypto/ecdsa"
 	"errors"
 	"fmt"
 	"io"
@@ -60,6 +61,7 @@ var (
 const (
 	SwarmEnvChequebookAddr       = "SWARM_CHEQUEBOOK_ADDR"
 	SwarmEnvAccount              = "SWARM_ACCOUNT"
+	SwarmEnvBzzKeyHex            = "SWARM_BZZ_KEY_HEX"
 	SwarmEnvListenAddr           = "SWARM_LISTEN_ADDR"
 	SwarmEnvPort                 = "SWARM_PORT"
 	SwarmEnvNetworkID            = "SWARM_NETWORK_ID"
@@ -121,9 +123,9 @@ func buildConfig(ctx *cli.Context) (config *bzzapi.Config, err error) {
 
 //finally, after the configuration build phase is finished, initialize
 func initSwarmNode(config *bzzapi.Config, stack *node.Node, ctx *cli.Context, nodeconfig *node.Config) error {
-	//at this point, all vars should be set in the Config
 	//get the account for the provided swarm account
-	prvkey := getAccount(config.BzzAccount, ctx, stack)
+	var prvkey *ecdsa.PrivateKey
+	config.BzzAccount, prvkey = getOrCreateAccount(ctx, stack)
 	//set the resolved config path (geth --datadir)
 	config.Path = expandPath(stack.InstanceDir())
 	//finally, initialize the configuration