tripleo-kernel: Adding reboot_protection variable

When the role is included, the params and variables have higher
precedence than the set_fact, thus not taking the set_fact defer_reboot
into account.

Adding a reboot_protection variable that is not included when calling
the role will prevent this behavior.

Resolves: rhbz#1975240
Related: https://bugzilla.redhat.com/show_bug.cgi?id=1975240
Change-Id: If2d9a8a21f19e4fe7699c0ac932c9801fd133474
(cherry picked from commit 39a809f9e7)
(cherry picked from commit f2caac2432)
(cherry picked from commit ce09f4b022)
(cherry picked from commit b7481fe94e)

tripleo_ansible/roles/tripleo-kernel/defaults/main.yml

@@ -23,3 +23,4 @@ tripleo_kernel_args: ""
 tripleo_kernel_reboot_timeout: 3600
 tripleo_kernel_post_reboot_delay: 60
 tripleo_kernel_defer_reboot: false
+tripleo_kernel_reboot_protection: false

tripleo_ansible/roles/tripleo-kernel/tasks/kernelargs.yml

@@ -41,6 +41,7 @@
         - name: Setting defer reboot fact
           set_fact:
             tripleo_kernel_defer_reboot: true
+            tripleo_kernel_reboot_protection: true
 
 - name: Check if the kernelargs entry is already present in the file
   replace:
@@ -125,6 +126,7 @@
   when:
     - reboot_required is defined and reboot_required
     - not tripleo_kernel_defer_reboot|bool
+    - not tripleo_kernel_reboot_protection|bool
   block:
     - name: Reboot tasks
       include_tasks: reboot.yaml