Provide software config name in api test

This is mandatory in api but not for SoftwareConfig
resource in the template.

Change-Id: Ic03976ecd8994dd3a52e776c66e6397ba5d022f1
Task: 33531
diff --git a/heat_tempest_plugin/tests/api/gabbits/softwareconfig.yaml b/heat_tempest_plugin/tests/api/gabbits/softwareconfig.yaml
index 0d0453d..018b29c 100644
--- a/heat_tempest_plugin/tests/api/gabbits/softwareconfig.yaml
+++ b/heat_tempest_plugin/tests/api/gabbits/softwareconfig.yaml
@@ -12,6 +12,7 @@
   request_headers:
     content-type: application/json
   data:
+    name: $ENVIRON['PREFIX']-config
     group: script
     config: '#!/bin/sh -x\necho hello'
   status: 200