Add overcloud delete role

The role will delete the current overcloud

Change-Id: I2e3d36d39bd2693588a70bbd5ac6e36666e79f84

playbooks/deploy-delete.yml

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+# This is the playbook used by the `quickstart.sh` script.
+
+- include: quickstart-extras.yml
+
+- name: Collect logs, create docs, publish
+  hosts: all:!localhost
+  gather_facts: no
+  roles:
+    - { role: tripleo-collect-logs, artcl_collect: true }
+
+- name: test overcloud deletion
+  hosts: undercloud
+  gather_facts: no
+  roles:
+    - { role: overcloud-delete }

roles/overcloud-delete/defaults/main.yml

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+# Script and log locations used during the delete process.
+delete_script: overcloud_delete.sh.j2
+delete_log: "{{ working_dir }}/overcloud_delete.log"
+
+# 30 retries * 10 seconds delay = 5 minutes delete timeout
+delete_check_retries: 30
+delete_check_delay: 10
+step_delete_overcloud: false

roles/overcloud-delete/meta/main.yml

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+dependencies:
+  - extras-common

roles/overcloud-delete/tasks/main.yml

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+# Generate a script from templates. These are scripts
+# rather than additional ansible tasks so that they can be run
+# manually from the undercloud host.
+- name: Create overcloud delete script
+  template:
+    src: "{{ delete_script }}"
+    dest: "{{ working_dir }}/overcloud-delete.sh"
+    mode: 0755
+  tags:
+    - overcloud-scripts
+
+- block:
+  when: step_delete_overcloud|bool
+    - name: Delete the overcloud
+      shell: |
+        {{ working_dir }}/overcloud-delete.sh > {{ delete_log }} 2>&1
+      tags:
+        - overcloud-delete
+
+    - name: check for delete command to complete or fail
+      tasks:
+        - shell: |
+            heat stack-show $(cat {{ working_dir }}/overcloud_id)
+          register: heat_stack_show
+          delay: {{ delete_check_delay }}
+          retries: {{ delete_check_retries }}
+          until: {{ heat_show.stdout.find("DELETE_COMPLETE") }}
+      tags:
+        - overcloud-delete

roles/overcloud-delete/templates/overcloud_delete.sh.j2

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+### --start_docs
+## Delete the overcloud deployment
+## ===============================
+
+## * Gather informations on the deployment
+## ::
+
+source {{ working_dir}}/stackrc
+OVERCLOUD_NAME="overcloud"
+OVERCLOUD_ID=$(openstack stack list | grep "$OVERCLOUD_NAME" | awk '{print $2}')
+echo $OVERCLOUD_ID > {{ working_dir }}/overcloud_id
+
+## * select the correct command for the deletion
+## ::
+
+if heat stack-delete --help | grep -q "\-\-yes"; then
+    heat stack-delete --yes "$OVERCLOUD_NAME"
+else
+    heat stack-delete "$OVERCLOUD_NAME"
+fi
+
+### --stop_docs