add select go version for livetest.yml (#281)

Author: cxznmhdcxz

.azure-pipelines/livetest.yml

@@ -3,5 +3,9 @@ jobs:
     pool:
       vmImage: 'Ubuntu 18.04'
     steps:
+      - task: GoTool@0
+        inputs:
+          version: '1.13'
+        displayName: "Select Go Version"
       - template: steps/init_workspace.yml
       - template: steps/live_test.yml