Stop generating ssh keypair for ironic user

There is no obvious need to have an SSH keypairs for ironic user
I was not able to find any proof in the project installation guide that
such keypairs were ever needed. Thus, such functionality is removed.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-plugins/+/896017
Change-Id: I493d5f5aa0a915e7bc9fb7dbcd2673749c0b95d3

defaults/main.yml

@@ -228,11 +228,6 @@ ironic_db_connection_string: >-
 # Common configuration
 ironic_node_name: ironic
 
-# If you want to regenerate the ironic users SSH keys, on each run, set this
-# var to True. Otherwise keys will be generated on the first run and not
-# regenerated each run.
-ironic_recreate_keys: False
-
 ironic_tftp_server_address: "{{ ironic_bmaas_address }}"
 
 # Use this variable to add extra files into the ironic_tftp_root directory

releasenotes/notes/no_ironic_ssh_keypairs-b666bcdd67ca179b.yaml

@@ -0,0 +1,6 @@
+---
+deprecations:
+  - |
+    Generation of SSH keypairs for Ironic users has been deprecated
+    and removed.
+    A variable ``ironic_recreate_keys`` has been removed and has no effect.

tasks/ironic_pre_install.yml

@@ -19,16 +19,6 @@
     state: "present"
     system: "yes"
 
-- name: Remove old key file(s) if found
-  file:
-    path: "{{ item }}"
-    state: "absent"
-  with_items:
-    - "{{ ironic_system_home_folder }}/.ssh/authorized_keys"
-    - "{{ ironic_system_home_folder }}/.ssh/id_rsa"
-    - "{{ ironic_system_home_folder }}/.ssh/id_rsa.pub"
-  when: ironic_recreate_keys | bool
-
 - name: Create ironic system users
   user:
     name: "{{ ironic_system_user_name }}"
@@ -38,7 +28,6 @@
     system: "yes"
     createhome: "yes"
     home: "{{ ironic_system_home_folder }}"
-    generate_ssh_key: "yes"
 
 - name: Create ironic dir
   file: