Fix images pull in ovs-dpdk role

This patch fixes ovs-dpdk images pull by adding
the variable kolla_role_name to the ovs-dpdk vars, so
services-image-pull can work correctly.

Closes-Bug: #2041864
Change-Id: I2e799290a57ebfacbc0ff9a0b1ca3dc956c513df
Signed-off-by: German Espinoza <gespinoza@whitestack.com>

ansible/roles/ovs-dpdk/vars/main.yml

 ---
 project_name: "ovs"
+
+kolla_role_name: "ovsdpdk"

releasenotes/notes/bug-2041864-f19f9a6afd0955e8.yaml

+---
+fixes:
+  - |
+    Fixes ``ovs-dpdk`` images pull.
+    `LP#[2041864] <https://launchpad.net/bugs/2041864>`__