Create scenario tests for load balancers

This patch implements the tempest plugin for
for testing load balancer creation in Octavia.

Co-Authored-By: Jude Cross <jcross@godaddy.com>
Co-Authored-By: Lingxian Kong <anlin.kong@gmail.com>

Depends-On: https://review.openstack.org/557856
Change-Id: I57064f8e0834efba8859a780394a1c69851cc917
diff --git a/playbooks/Octavia-DSVM/pre.yaml b/playbooks/Octavia-DSVM/pre.yaml
new file mode 100644
index 0000000..1e7987c
--- /dev/null
+++ b/playbooks/Octavia-DSVM/pre.yaml
@@ -0,0 +1,11 @@
+- hosts: all
+  name: Octavia DSVM jobs pre-run playbook
+  tasks:
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          if $(egrep --quiet '(vmx|svm)' /proc/cpuinfo) && [[ ! $(hostname) =~ "ovh" ]]; then
+              export DEVSTACK_GATE_LIBVIRT_TYPE=kvm
+          fi
+