Update issue templates

Author: kjetilk

.github/ISSUE_TEMPLATE/nss-5-0-0-regressions.md

@@ -0,0 +1,20 @@
+---
+name: NSS-5.0.0 Regressions
+about: To report regressions in 5.0.0 (i.e. things that used to work in earlier releases),
+  use this template
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Please describe what you did in reproducible steps
+
+
+## How did it work with 4.x series servers?
+
+
+## What happened when you tried the same with the 5.0.0 beta?
+
+
+## Any material that will help, logs, error messages, etc.