Add default metadata for public network

Add deafult value for all models
Metadata will be replace in deployment by steps
from shared-salt:
https://github.com/Mirantis/tcp-qa/blob/master/tcp_tests/templates/shared-salt.yaml#L431

Change-Id: I99f4daaa0aee28ca6eca3b9cae3cc380c749d58d
diff --git a/tcp_tests/templates/cookied-bm-contrail40/lab04-physical-inventory.yaml b/tcp_tests/templates/cookied-bm-contrail40/lab04-physical-inventory.yaml
index 5cb47fb..1639192 100644
--- a/tcp_tests/templates/cookied-bm-contrail40/lab04-physical-inventory.yaml
+++ b/tcp_tests/templates/cookied-bm-contrail40/lab04-physical-inventory.yaml
@@ -75,3 +75,10 @@
         enp5s0f1:

           role: single_vlan_ctl

           single_address: 10.167.8.102

+

+environment_metadata:

+    public_gateway: 172.17.16.1

+    public_cidr: 172.17.16.0/24

+    public_allocation_start: 172.17.16.201

+    public_allocation_end: 172.17.16.245

+    tempest_test_target: ctl01*