fix command run path bug (#52)

* rebase upstream

* rebase

* trim no need line

* trim no need line

* trim no need line

* optimized go path logic

Co-authored-by: kingxt <dream4kingxt@163.com>

tools/goctl/rpc/gen/gencall.go

@@ -169,7 +169,7 @@ func (g *defaultRpcGenerator) genCall() error {
 	// if mockgen is already installed, it will generate code of gomock for shared files
 	_, err = exec.LookPath("mockgen")
 	if mockGenInstalled {
-		execx.Run(fmt.Sprintf("go generate %s", filename))
+		execx.Run(fmt.Sprintf("go generate %s", filename), "")
 	}
 
 	return nil