Use 'system.foundation' image to bootstrap foundation node

Change-Id: I584d0cf080f647806145d98e73461169c5331129
diff --git a/tcp_tests/templates/_heat_environments/eu-cloud.env b/tcp_tests/templates/_heat_environments/eu-cloud.env
index 5b3b03b..e053283 100644
--- a/tcp_tests/templates/_heat_environments/eu-cloud.env
+++ b/tcp_tests/templates/_heat_environments/eu-cloud.env
@@ -37,6 +37,8 @@
 
   net_public: public
 
+  foundation_image: system.foundation
+
   nameservers: 172.18.208.44
   control_subnet_cidr: "10.6.0.0/24"
   tenant_subnet_cidr: "10.8.0.0/24"
diff --git a/tcp_tests/templates/_heat_environments/fragments/FoundationNode.yaml b/tcp_tests/templates/_heat_environments/fragments/FoundationNode.yaml
index 6923881..2530625 100644
--- a/tcp_tests/templates/_heat_environments/fragments/FoundationNode.yaml
+++ b/tcp_tests/templates/_heat_environments/fragments/FoundationNode.yaml
@@ -7,6 +7,8 @@
     type: string
   instance_flavor:
     type: string
+  instance_image:
+    type: string
   instance_name:
     type: string
   instance_config_host:
@@ -58,7 +60,7 @@
     properties:
       image_update_policy: REBUILD
       flavor: { get_param: instance_flavor }
-      image: { list_join: ['', [ 'ubuntu-16.04-foundation-', { get_param: mcp_version } ]] }
+      image: { get_param: instance_image }
       key_name: { get_param: key_pair }
       name:
         list_join: