Fix for ocata

We use this version of heat tempest plugin for ocata too, and
heat does not work with template version pike.

Change-Id: I5ba0fcfbd0d8604b5b4e58bb8738d5b97738627f
Related-Prod: PROD-18239
diff --git a/heat_tempest_plugin/tests/api/gabbits/stacks.yaml b/heat_tempest_plugin/tests/api/gabbits/stacks.yaml
index cb67e71..bc670e4 100644
--- a/heat_tempest_plugin/tests/api/gabbits/stacks.yaml
+++ b/heat_tempest_plugin/tests/api/gabbits/stacks.yaml
@@ -56,7 +56,7 @@
     parameters: {'test_val': value}
     stack_name: $ENVIRON['PREFIX']-stack
     template:
-      heat_template_version: pike
+      heat_template_version: '2016-04-08'
       parameters:
         test_val:
           type: string
@@ -97,7 +97,7 @@
     parameters: {'test_val': new_value}
     stack_name: $ENVIRON['PREFIX']-stack
     template:
-      heat_template_version: pike
+      heat_template_version: '2016-04-08'
       parameters:
         test_val:
           type: string