fix(ansible): broaden superuser creation error check (#6)

Author: histrio

ansible/deploy.yml

@@ -217,5 +217,5 @@
         DJANGO_SUPERUSER_EMAIL: "{{ django_superuser_email | default('admin@example.com') }}"
         DJANGO_SUPERUSER_PASSWORD: "{{ django_superuser_password | default('admin') }}"
       register: superuser_result
-      failed_when: superuser_result.rc != 0 and 'already exists' not in superuser_result.stderr
+      failed_when: superuser_result.rc != 0 and 'already exists' not in superuser_result.stderr and 'already taken' not in superuser_result.stderr
       changed_when: superuser_result.rc == 0