cmd/puppeth: use geth's prompt to read input (#23718)

* cmd/puppeth: use geth's prompt to read input

* remove wizard.in

* cmd/puppeth: fix compilation errors

* reset prompt (don't exit) on receiving ctrl-c

* make promptInput spin until the user enters a value or interrupts (ctrl-d)

* make promptInput use parameter

Co-authored-by: Martin Holst Swende <martin@swende.se>

cmd/puppeth/wizard_intro.go

@@ -17,7 +17,6 @@
 package main
 
 import (
-	"bufio"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -38,7 +37,6 @@ func makeWizard(network string) *wizard {
 		},
 		servers:  make(map[string]*sshClient),
 		services: make(map[string][]string),
-		in:       bufio.NewReader(os.Stdin),
 	}
 }