Added continous delivery playbook to discovery service refresh metadata (#3310)

ECOM-5134

playbooks/continuous_delivery/discovery_refresh_metadata.yml

+# This playbook will run the refresh_course_metadata management command. It is intended solely for usage with the
+# Catalog/Course Discovery Service.
+#
+# Required variables for this playbook:
+#
+#   - APPLICATION_PATH                - the top-level path of the Django application; the application lives underneath
+#                                       this directory in a directory with the same name as APPLICATION_NAME.
+#   - APPLICATION_NAME                - The name of the application that we are migrating.
+#   - APPLICATION_USER                - user which is meant to run the application
+#   - HIPCHAT_TOKEN                   - API token to send messages to hipchat
+#   - HIPCHAT_ROOM                    - ID or name of the room to send the notification
+#   - HIPCHAT_URL                     - URL of the hipchat API  (defaults to v1 of the api)
+#
+# Example command line to run this playbook:
+#    ansible-playbook -vvvv -i "localhost," -c local \
+#       -e @overrides.yml \
+#       discovery_refresh_metadata.yml
+#
+
+
+
+- hosts: all
+  vars:
+    HIPCHAT_URL: https://api.hipchat.com/v2/
+    COMMAND_PREFIX: " . {{ APPLICATION_PATH }}/{{ APPLICATION_NAME }}_env; /edx/bin/python.{{ APPLICATION_NAME }} /edx/bin/manage.{{ APPLICATION_NAME }}"
+  gather_facts: False
+  tasks:
+
+  - name: Refresh metadata
+    shell: '{{ COMMAND_PREFIX }} refresh_course_metadata'
+    become_user: "{{ APPLICATION_USER }}"
+
+  - name: Send Hipchat notification
+    hipchat_2_0_0_1:
+      api: "{{ HIPCHAT_URL }}"
+      token: "{{ HIPCHAT_TOKEN }}"
+      room: "{{ HIPCHAT_ROOM }}"
+      msg: "Catalog metadata has been refreshed."
+    ignore_errors: yes
+    when: HIPCHAT_TOKEN is defined