iscsigw: refact tasks directory layout

This commit moves containerized deployment related files to `./tasks/
directory. This is needed to make `docker-to-podman.yml` working since
we use `tasks_from:` option.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit 4636f3f7e2)

infrastructure-playbooks/docker-to-podman.yml

@@ -75,7 +75,7 @@
 
     - import_role:
         name: ceph-iscsi-gw
-        tasks_from: container/systemd.yml
+        tasks_from: systemd.yml
       when: inventory_hostname in groups.get(iscsi_gw_group_name, [])
 
     - import_role:

roles/ceph-iscsi-gw/tasks/main.yml

@@ -20,5 +20,5 @@
     - not use_new_ceph_iscsi | bool
 
 - name: include containerized.yml
-  include_tasks: container/containerized.yml
+  include_tasks: containerized.yml
   when: containerized_deployment | bool