Decouple heat-plugin and allocation-pool parameters

service.runtest.tempest.neutron class contains subnet pool which
isn't supported in case of opencontrail environments. Heat
specific parameters can be placed in separate class, and class
with subnet pool can be added in model on cluster level.
Closes-bug: PROD-27115 (PROD:27115)

Change-Id: I1cce149a8e69bec6355643cff112c4da5cb013c8
diff --git a/metadata/service/tempest/init.yml b/metadata/service/tempest/init.yml
index 162d983..707ca47 100644
--- a/metadata/service/tempest/init.yml
+++ b/metadata/service/tempest/init.yml
@@ -2,7 +2,7 @@
   - service.runtest.tempest.artifactory
   - service.runtest.tempest.glance
   - service.runtest.tempest.nova
-  - service.runtest.tempest.neutron
+  - service.runtest.tempest.heat
 applications:
   - runtest
 parameters: