問題詳情：
go環境安裝好後，執行go程式碼也沒有問題
下載govendor包的時候提示：
cannot download, /home/azhukov/go is a GOROOT, not a GOPATH
解決方法：
This error is caused by the go tool detecting a Go installation in your GOPATH. It's not telling you that your GOPATH is the GOROOT (that's a different message), it's telling your GOPATH looks like aGOROOT.
Cleaning out your GOPATH and running go get again will fix the error.
檢視GOROOT和GOPATH配置均沒有問題，後發現GOPATH資料夾下目錄結構和GOROOT一樣，不知道何時go在GOPATH下也安裝了。
刪除GOPATH資料夾下所有檔案，重新執行命令，問題解決。
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