Allow 'automated' and 'edx_service' roles to be run multiple times.

playbooks/roles/automated/meta/main.yml

+---
+#
+# edX Configuration
+#
+# github:     https://github.com/edx/configuration
+# wiki:       https://openedx.atlassian.net/wiki/display/OpenOPS
+# code style: https://openedx.atlassian.net/wiki/display/OpenOPS/Ansible+Code+Conventions
+# license:    https://github.com/edx/configuration/blob/master/LICENSE.TXT
+#
+
+# Allow this role to be duplicated in dependencies.
+allow_duplicates: yes

playbooks/roles/edx_service/meta/main.yml

@@ -30,3 +30,6 @@ dependencies:
     GIT_REPOS: "{{ edx_service_repos }}"
     git_home: "{{ edx_service_home }}"
     when: edx_service_repos is defined
+
+# Allow this role to be duplicated in dependencies.
+allow_duplicates: yes