Error message during plugin build

[ilijabojanovic]

On v2.9.3-rc1 tag

When we run command to generate go plugin we have errors in console. Go plugin is created but message is visible

Reproduction steps:

1. In terminal execute docker run -v pwd:/go/src/plugin-build tykio/tyk-plugin-compiler:v2.9.3-rc1 my-post-plugin.so

Console message:

hybrid docker run -v `pwd`:/go/src/plugin-build tykio/tyk-plugin-compiler:v2.9.3-rc1 my-post-plugin.so
+ PLUGIN_BUILD_PATH=/go/src/plugin-build
+ plugin_name=my-post-plugin.so
+ '[' -z my-post-plugin.so ']'
+ yes
+ cp -r /go/src/plugin-build/vendor /go/src
cp: cannot stat '/go/src/plugin-build/vendor': No such file or directory
+ true
+ rm -rf /go/src/plugin-build/vendor
+ cd /go/src/plugin-build
+ go build -buildmode=plugin -o my-post-plugin.so

cp: cannot stat '/go/src/plugin-build/vendor': No such file or directory

Testing go file:

package main
import (
	"encoding/json"
	"net/http"
	"time"
	"github.com/TykTechnologies/tyk/log"
)
func ResponseSendCurrentTime(rw http.ResponseWriter, r *http.Request) {
	var logger = log.Get()
	logger.Info("Processing HTTP request in Golang plugin!! - ResponseSendCurrentTime")
	now := time.Now().String()
	// prepare data to send
	replyData := map[string]string{
		"current_time": now,
	}
	jsonData, err := json.Marshal(replyData)
	if err != nil {
		rw.WriteHeader(http.StatusInternalServerError)
		return
	}
	// check if we don't need to send reply
	if r.URL.Query().Get("get_time") != "2" {
		// allow request to be processed and sent to upstream
		r.Header.Add("current_time", now)
		return
	}
	// send HTTP response from Golang plugin
	rw.Header().Set("Content-Type", "application/json")
	rw.WriteHeader(http.StatusOK)
	rw.Write(jsonData)
}
func main() {}

[letzya]

This is important for our DX. User doesn't know if he should or not ignore this so we should either get rid of the error or print a message " you can ignore this error".