increase coverage to 80% (sonic-net#2214)

wen587 · web-flow · commit fc5633fa15bf · 2022-06-16T13:11:30.000+08:00
What I did
Change diff coverage threshold to 80%
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
@@ -20,7 +20,7 @@ stages:
   - job:
     displayName: "Python3"
     variables:
-      DIFF_COVER_CHECK_THRESHOLD: 50
+      DIFF_COVER_CHECK_THRESHOLD: 80
       DIFF_COVER_ENABLE: 'true'
     pool:
       vmImage: ubuntu-20.04
