Add updated tuning configuration

Uses a much nicer CPU tuning configuration, leveraging systemd's
AllowedCPUs and CPUAffinity options within a set of slices (some
default, some custom).

Configuration is also greatly simplified versus the previous
implementation, simply asking for a number of CPUS for both the system
and OSDs, and calculating everything else that is required.

Also switches (back) to the v2 unified cgroup hierarchy by default as
required by the systemd AllowedCPUs directive.

roles/pvc/tasks/main.yml

@@ -56,6 +56,11 @@
 - include: pvc/main.yml
   tags: pvc-daemon
 
+# Install CPU tuning
+- include: cputuning/main.yml
+  tags: pvc-cputuning
+  when: cpu_tuning is defined
+
 - name: restart server on first install
   shell: 'sleep 3 && shutdown -r now "Ansible updates triggered"'
   async: 1