Add prx_flavor to heat-cicd-pike-contrail41-sl

Change-Id: I0973668e652542dccbc7bedb9a2961dd32ddeae2
diff --git a/tcp_tests/templates/heat-cicd-pike-contrail41-sl/underlay.hot b/tcp_tests/templates/heat-cicd-pike-contrail41-sl/underlay.hot
index 54f31e1..e5fe830 100644
--- a/tcp_tests/templates/heat-cicd-pike-contrail41-sl/underlay.hot
+++ b/tcp_tests/templates/heat-cicd-pike-contrail41-sl/underlay.hot
@@ -62,6 +62,8 @@
     type: string
   vsrx_flavor:
     type: string
+  prx_flavor:
+    type: string
   net_public:
     type: string