Move environment to a var fo easier debugging

If we configure the environment vars as an internal variable it allows
us to print them out with the command when debugging is enabled.

Change-Id: Ida7b9f1a4c3b27c7f702bf47d5992646eb34430c

roles/tripleo_overcloud_deploy/tasks/main.yml

@@ -44,20 +44,7 @@
       {{ tripleo_overcloud_deploy_baremetal_deployment | ternary('--baremetal-deployment $DEPLOY_BAREMETAL_DEPLOYMENT', '') }}
       {{ tripleo_overcloud_deploy_log_output | ternary((">" ~ tripleo_overcloud_deploy_log), '') }}
       {{ tripleo_overcloud_deploy_log_combine | ternary("2>&1", '') }}
-
-- name: Preserve existing log file if exists
-  timestamp_file:
-    path: "{{ tripleo_overcloud_deploy_log }}"
-  when: tripleo_overcloud_deploy_log_output|bool
-
-- name: Show the overcloud deploy command
-  debug:
-    var: _deploy_cmd
-  when: tripleo_overcloud_deploy_debug|bool
-
-- name: Overcloud deploy
-  shell: "{{ _deploy_cmd }}"  # noqa 305
-  environment:
+    _deploy_env:
       DEPLOY_TEMPLATES: "{{ tripleo_overcloud_deploy_templates }}"
       DEPLOY_STACK: "{{ tripleo_overcloud_deploy_stack }}"
       DEPLOY_TIMEOUT_ARG: "{{ tripleo_overcloud_deploy_timeout_arg }}"
@@ -78,6 +65,26 @@
       DEPLOY_CONFIG_DOWNLOAD_TIMEOUT: "{{ tripleo_overcloud_deploy_config_download_timeout }}"
       DEPLOY_PYTHON_INTERPRETER: "{{ tripleo_overcloud_deploy_deployment_python_interpreter }}"
       DEPLOY_BAREMETAL_DEPLOYMENT: "{{ tripleo_overcloud_deploy_baremetal_deployment }}"
+
+- name: Preserve existing log file if exists
+  timestamp_file:
+    path: "{{ tripleo_overcloud_deploy_log }}"
+  when: tripleo_overcloud_deploy_log_output|bool
+
+- name: Show debug information
+  when: tripleo_overcloud_deploy_debug|bool
+  block:
+    - name: Show the overcloud deploy command
+      debug:
+        var: _deploy_cmd
+
+    - name: Show the overcloud deploy environment
+      debug:
+        var: _deploy_env
+
+- name: Overcloud deploy
+  shell: "{{ _deploy_cmd }}"  # noqa 305
+  environment: "{{ _deploy_env }}"
   args:
     chdir: "{{ tripleo_overcloud_deploy_home_dir }}"
     warn: false