nfs: rename two tasks

set the name of those tasks accordingly with the fact name being set.
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

roles/ceph-nfs/tasks/start_nfs.yml

 ---
 - block:
-  - name: set_fact container_exec_cmd_nfs - external
+  - name: set_fact exec_cmd_nfs - external
     set_fact:
       exec_cmd_nfs: "{{ container_binary + ' run --rm --net=host -v /etc/ceph:/etc/ceph:z -v /var/lib/ceph/:/var/lib/ceph/:z -v /var/log/ceph/:/var/log/ceph/:z --entrypoint=rados ' + ceph_docker_registry + '/' + ceph_docker_image + ':' + ceph_docker_image_tag if containerized_deployment | bool else 'rados' }} -n client.{{ ceph_nfs_ceph_user }} -k /var/lib/ceph/radosgw/{{ cluster }}-rgw.{{ ceph_nfs_ceph_user }}/keyring"
       delegate_node: "{{ inventory_hostname }}"
     when: groups.get(mon_group_name, []) | length == 0
 
-  - name: set_fact container_exec_cmd_nfs - internal
+  - name: set_fact exec_cmd_nfs - internal
     set_fact:
       exec_cmd_nfs: "{{ container_binary + ' exec ceph-mon-' + hostvars[groups[mon_group_name][0]]['ansible_facts']['hostname'] if containerized_deployment | bool else '' }} rados"
       delegate_node: "{{ groups[mon_group_name][0] }}"