packer/rpc: remove unused test file

packer/rpc/rpc_test.go

-package rpc
-
-import (
-	"net"
-	"net/rpc"
-)
-
-// This starts a RPC server for the given interface listening on the
-// given address. The RPC server is ready when "readyChan" receives a message
-// and the RPC server will quit when "stopChan" receives a message.
-//
-// This function should be run in a goroutine.
-func testRPCServer(laddr string, name string, iface interface{}, readyChan chan int, stopChan <-chan int) {
-	listener, err := net.Listen("tcp", laddr)
-	if err != nil {
-		panic(err)
-	}
-
-	// Close the listener when we exit so that the RPC server ends
-	defer listener.Close()
-
-	// Start the RPC server
-	server := rpc.NewServer()
-	server.RegisterName(name, iface)
-
-	go func() {
-		for {
-			conn, err := listener.Accept()
-			if err != nil {
-				// If there is an error, just ignore it.
-				break
-			}
-
-			go server.ServeConn(conn)
-		}
-	}()
-
-	// We're ready!
-	readyChan <- 1
-
-	// Block on waiting to receive from the channel
-	<-stopChan
-}