Allow stopping ubuntu unattended-upgrades (#12174)

Signed-off-by: Ekko Tu <lihai.tu@daocloud.io>

roles/bootstrap_os/defaults/main.yml

@@ -19,6 +19,8 @@ use_oracle_public_repo: true
 ## Ubuntu specific variables
 # Disable unattended-upgrades for Linux kernel and all packages start with linux- on Ubuntu
 ubuntu_kernel_unattended_upgrades_disabled: false
+# Stop unattended-upgrades if it is currently running on Ubuntu
+ubuntu_stop_unattended_upgrades: false
 
 fedora_coreos_packages:
   - python

roles/bootstrap_os/tasks/ubuntu.yml

@@ -19,3 +19,11 @@
   when:
     - ubuntu_kernel_unattended_upgrades_disabled
     - unattended_upgrades_file_stat.stat.exists
+
+- name: Stop unattended-upgrades service
+  service:
+    name: unattended-upgrades
+    state: stopped
+    enabled: false
+  become: true
+  when: ubuntu_stop_unattended_upgrades