Add custom environment files for standalone

This change adds the ability to add additional environment files to the
standalone deployment.

Change-Id: I469380d5f401ed1aeeb104376d475673da07ccee

roles/standalone/README.md

@@ -34,6 +34,8 @@ Role Variables
 
 - standalone_ansible_lint: <'false'> -- Perform ansible lint on the generated ansible playbooks
 
+- standalone_custom_env_files: <'[]'> -- list of additional environment files to be added to the deployment command (do not include the -e)
+
 Dependencies
 ------------
 

roles/standalone/defaults/main.yml

@@ -26,3 +26,5 @@ standalone_selinux_mode: permissive
 standalone_libvirt_type: kvm
 
 standalone_container_cli: docker
+
+standalone_custom_env_files: []

roles/standalone/templates/standalone.sh.j2

@@ -5,5 +5,8 @@ sudo openstack tripleo deploy \
   -r {{ overcloud_templates_path }}/roles/{{ standalone_role }} \
   -e "{{ working_dir }}/containers-prepare-parameters.yaml" \
   -e "{{ working_dir }}/standalone_parameters.yaml" \
+{% if standalone_custom_env_files %}
+  -e {{ standalone_custom_env_files | join(' -e ') }} \
+{% endif %}
   --output-dir {{ working_dir }} \
   --standalone