Ensure $tuned_params is restored after grub2-mkconfig

The playbook cli-overcloud-node-kernelargs.yaml calls the tuned role
and then the tripleo_kernel role.

The tuned role executes the following command:
    tuned-adm profile throughput-performance

This has the side-effect of adding $tuned_params to the options line
of /boot/loader/entries files, which is required to add its kernel
arguments from /boot/grub2/grubenv.

However when grub2-mkconfig is called, $tuned_params is *removed* from
the /boot/loader/entries files, breaking the enablement of the tuned
profile.

This change runs tuned-adm after grub2-mkconfig, which adds back
$tuned_params if there is an active profile.

Change-Id: I6edef63e60623ea3b51386593d76b18092dd7f30
Resolves: rhbz#2122949

tripleo_ansible/roles/tripleo_kernel/tasks/kernelargs.yml

@@ -168,6 +168,21 @@
         dest: "{{ item.stat.path }}/grubenv"
       when: item.stat.exists|bool
       loop: "{{ grub_stat.results }}"
+
+    - name: Check for active tuned profile
+      stat:
+        path: "/etc/tuned/active_profile"
+      register: tuned_active_profile
+
+    - name: Ensure $tuned_params is restored to /boot/loader/entries files
+      shell: >-
+        tuned-adm profile $(cat /etc/tuned/active_profile)
+      environment:
+        PATH: "/bin:/usr/bin:/sbin:/usr/sbin"
+      when:
+      - tuned_active_profile.stat.exists
+      - tuned_active_profile.stat.size | int > 0
+
     - name: Set reboot required fact
       set_fact:
         reboot_required: true