Allow to pass custom vsrx image

Related-Prod: PRODX-11488
Change-Id: I3884a8cd3cd4129d7e74a5d425fffc958ce6020b
diff --git a/de/heat-templates/top.yaml b/de/heat-templates/top.yaml
index 757f689..7864c06 100644
--- a/de/heat-templates/top.yaml
+++ b/de/heat-templates/top.yaml
@@ -272,6 +272,12 @@
     description: If set true then AIO is going to be deployed.
     type: string
     default: 'false'
+  vsrx_image:
+    type: string
+    default: vsrx-mcp2-tf-3-nets
+  vsrx_flavor:
+    type: string
+    default: oc_vsrx
 
 conditions:
   aio_deploy:
@@ -316,6 +322,8 @@
       accessible_network: { get_attr: [accessible_network, public_network]}
       data_network_vsrx_ip: { get_param: data_network_vsrx_ip }
       tun_network: { get_attr: [tun_network, tun_network_id] }
+      vsrx_image: { get_param: vsrx_image }
+      vsrx_flavor: { get_param: vsrx_flavor }
 
   storage_network:
     type: MCP2::NetworkAccStorage