Move swift service conflicted check into precheck.yml

the precheck action should better move in precheck.yml

Change-Id: I233cc73e7c16dd0d7f98338966d964417da7d0ad

ansible/roles/ceph/tasks/precheck.yml

@@ -15,3 +15,8 @@
   when:
     - container_facts['ceph_rgw'] is not defined
     - inventory_hostname in groups['ceph-rgw']
+
+- name: Check whether the swift service is enabled
+  local_action: fail msg='Ceph-rgw-keystone is conflicts with swift, you should only enable one of them'
+  when: enable_swift | bool
+  run_once: True

ansible/roles/ceph/tasks/start_rgw_keystone.yml

 ---
-- name: Check whether the swift service is enabled
-  local_action: fail msg='Ceph-rgw-keystone is conflicted with swift, you should only enable one of them'
-  when: enable_swift | bool
-  run_once: True
-
 - name: Creating the Swift service and endpoint
   kolla_toolbox:
     module_name: kolla_keystone_service