Run with KVM if we can in tests

We should not Set nova_virt_type.
This way detection steps in, and kvm is used.

However, we should use qemu for OVH hosts:
There seem to be a bug in some OVH hosts
causing 'hardware error 0x0' when trying to run with kvm.

Change-Id: I4f679815ac55095000dc1017cebbd1a8bf0f6c5f
(cherry picked from commit 748e3d2292)

common-tasks/test-set-nodepool-vars.yml

@@ -29,6 +29,9 @@
         echo "opensuse_mirror=${NODEPOOL_OPENSUSE_MIRROR}"
         echo "pip_default_index=${NODEPOOL_PYPI_MIRROR}"
         echo "pip_wheel_mirror=${NODEPOOL_WHEEL_MIRROR}"
+        if [[ ${NODEPOOL_PYPI_MIRROR} == *.ovh.* ]]; then
+          echo "nova_virt_type='qemu'"
+        fi
       args:
         executable: /bin/bash
       register: nodepool_variables

test-vars.yml

@@ -195,7 +195,6 @@ nova_service_user_domain_id: default
 nova_service_user_name: nova
 nova_venv_bin: "/openstack/venvs/nova-{{ nova_venv_tag }}/bin"
 nova_venv_tag: "testing"
-nova_virt_type: qemu
 nova_discover_hosts_in_cells_interval: '-1'
 # lxd specific vars
 lxd_trust_password: "SuperSecrete"