Disable kvm on OVH infra instances

OVH infra hosts are causing "KVM: entry failed, hardware error 0x0"
failures where instances fail to start (cirros, etc.).
This patch excludes OVH instances from kvm enablement until the issue is
resolved.

Change-Id: I50006cb60deef6943d95c2c04c444dccca94c8b0
diff --git a/playbooks/Octavia-DSVM/pre.yaml b/playbooks/Octavia-DSVM/pre.yaml
index 02dfb84..1e7987c 100644
--- a/playbooks/Octavia-DSVM/pre.yaml
+++ b/playbooks/Octavia-DSVM/pre.yaml
@@ -5,7 +5,7 @@
         cmd: |
           set -e
           set -x
-          if egrep --quiet '(vmx|svm)' /proc/cpuinfo; then
+          if $(egrep --quiet '(vmx|svm)' /proc/cpuinfo) && [[ ! $(hostname) =~ "ovh" ]]; then
               export DEVSTACK_GATE_LIBVIRT_TYPE=kvm
           fi