Do not add swift user to ceilometer group

ceilimetermiddleware does not require access to any resources owned by
the system ceilometer user. It communicates with ceilometer services
over notification bus.

Change-Id: I5b30e4b7ec2b8c04f4bcc365aea32fbcbfddcc3a
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

tasks/ceilometer_pre_install.yml

@@ -29,17 +29,6 @@
     createhome: "yes"
     home: "{{ ceilometer_system_user_home }}"
 
-- name: Create the swift system user and add to ceilometer group
-  ansible.builtin.user:
-    name: "{{ swift_system_user_name }}"
-    group: "{{ ceilometer_system_group_name }}"
-    comment: "{{ swift_system_comment }}"
-    shell: "{{ swift_system_shell }}"
-    system: "yes"
-    createhome: "yes"
-    home: "{{ swift_system_home_folder }}"
-  when: swift_ceilometer_enabled | bool
-
 # NOTE(cloudnull): During an upgrade the local directory may exist on a source
 #                  install. If the directory does exist it will need to be
 #                  removed. This is required on source installs because the