retrace: Drop GID modification for now

The management of groups is opaque to me right now and it seems
modifying the GID in this case might be useless or even harmful
so let's drop it for now.

roles/abrt/retrace-pre/tasks/main.yml

@@ -18,8 +18,9 @@
       name: httpd
       state: stopped
 
-  # create uid - this is normaly done by retrace package
-  # but the package is not installed yet at this momement
+  # Create UID with our reserved UID. This is normaly done during the
+  # installation of the retrace-server package but it's not yet installed
+  # at this momement.
   - name: Ensure correct UID and home directory
     user:
       name: retrace
@@ -27,10 +28,15 @@
       home: "{{ retrace_user_home }}"
       create_home: yes
 
-  - name: Ensure correct GID
-    group:
-      name: retrace
-      gid: "{{ retrace_user_uid_gid }}"
+  # NOTE: We do not attempt to change the GID here if it's incorrect
+  # since groups are not managed locally (via /etc/group) on these servers.
+  # TODO: Find the correct way to do this and if it's even necessary.
+  # - name: Ensure correct GID
+  #   group:
+  #     name: retrace
+  #     gid: "{{ retrace_user_uid_gid }}"
+  #     system: yes
+  #     state: present
 
   - name: Restart httpd service after modifications are done
     service: