istio/istio is not for user submissions (istio#579)

* istio/istio is not for user submissions

* Update issue_template.md


Former-commit-id: 69aa2d7

.github/issue_template.md

@@ -1,17 +1,6 @@
-<!-- This form is for bug reports and feature requests ONLY! If you're looking for help check [Stack Overflow](https://stackoverflow.com/questions/tagged/istio) or Slack.
--->
-
-**Is this a BUG or FEATURE REQUEST?:**
-
-**Did you review existing epics or issues to identify if this already being worked on?** (please try to add the correct tags and epics):
-
-**Bug:**
-**What happened**:
+<!--
+Please see https://istio.io/troubleshooting/ and if you are a user or Istio, please file issues in
+https://github.com/istio/issues/issues instead of here
 
-**What you expected to happen:**
-
-**How to reproduce it:**
-
-
-**Feature Request:**
-**Describe the feature:**
+Please add the correct tags and epics (and priority and milestones if you have that information)
+-->