vendor: Update github.com/gogo/protobuf, keeping all files

gvt fetch -a, because we need the protobuf files etc for regeneration

vendor/github.com/gogo/protobuf/gogoreplace/main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+func main() {
+	args := os.Args
+	if len(args) != 4 {
+		fmt.Println("gogoreplace wants three arguments")
+		fmt.Println("	gogoreplace oldsubstring newsubstring filename")
+		os.Exit(1)
+	}
+	data, err := ioutil.ReadFile(args[3])
+	if err != nil {
+		panic(err)
+	}
+	data = bytes.Replace(data, []byte(args[1]), []byte(args[2]), -1)
+	if err := ioutil.WriteFile(args[3], data, 0666); err != nil {
+		panic(err)
+	}
+}