Add imports for DOMAIN_NAME and LAB_CONFIG_NAME for all templates

Change-Id: I36d8cd8f945fd76f9a7460823c999bbc90cf27bc
Reviewed-on: https://review.gerrithub.io/380067
Reviewed-by: Dennis Dmitriev <dis.xcom@gmail.com>
Tested-by: Dennis Dmitriev <dis.xcom@gmail.com>
diff --git a/tcp_tests/templates/physical_mcp11_dvr/underlay.yaml b/tcp_tests/templates/physical_mcp11_dvr/underlay.yaml
index c9ce694..dbd5f35 100644
--- a/tcp_tests/templates/physical_mcp11_dvr/underlay.yaml
+++ b/tcp_tests/templates/physical_mcp11_dvr/underlay.yaml
@@ -12,7 +12,8 @@
  - &cloudinit_user_data_cfg01 {{ CLOUDINIT_USER_DATA_CFG01 }}
  - &cloudinit_user_data {{ CLOUDINIT_USER_DATA_1604 }}
 
-{% set DOMAIN_NAME = os_env('LAB_CONFIG_NAME', 'physical_mcp11_dvr') + '.local' %}
+{% set LAB_CONFIG_NAME = os_env('LAB_CONFIG_NAME', 'physical_mcp11_dvr') %}
+{% set DOMAIN_NAME = os_env('DOMAIN_NAME', LAB_CONFIG_NAME) + '.local' %}
 {% set HOSTNAME_CFG01 = os_env('HOSTNAME_CFG01', 'cfg01.' + DOMAIN_NAME) %}
 {% set HOSTNAME_KVM01 = os_env('HOSTNAME_KVM01', 'kvm01.' + DOMAIN_NAME) %}
 {% set HOSTNAME_KVM02 = os_env('HOSTNAME_KVM02', 'kvm02.' + DOMAIN_NAME) %}