Always execute Nova virt type detection

This fix executes the nova virt type detection on any playbook run
and will eliminate the need to specify the nova-cpuinfo-read,
nova-virt-type-set tags along with the intended tag like nova-config.

Change-Id: Ic34011149f1355cfa48f4ee35537362e2d24e55d
Closes-Bug: #1587452
(cherry picked from commit a8d1e41)

tasks/nova_virt_detect.yml

@@ -20,10 +20,10 @@
   changed_when: false
   failed_when: false
   tags:
-    - nova-cpuinfo-read
+    - always
 
 - name: Register a fact for the nova virt type
   set_fact:
      nova_virt_type: "{{ ((virt_type_value.stdout | int) > 0) | ternary('kvm', 'qemu') }}"
   tags:
-    - nova-virt-type-set
+    - always