Add Ubuntu 20 to local dns bypass template (Azure#15951)

Co-authored-by: Praveen Kuttappan <praveen.kuttappan@gmail.com>

Author: azure-sdk

eng/common/pipelines/templates/steps/bypass-local-dns.yml

@@ -8,7 +8,9 @@ steps:
           succeededOrFailed(),
           or(
             eq(variables['OSVmImage'], 'ubuntu-18.04'),
-            eq(variables['OSVmImage'], 'MMSUbuntu18.04')
+            eq(variables['OSVmImage'], 'ubuntu-20.04'),
+            eq(variables['OSVmImage'], 'MMSUbuntu18.04'),
+            eq(variables['OSVmImage'], 'MMSUbuntu20.04')
           ),
           eq(variables['Container'], '')
         )