Adjust scenario tests for NotImplemented skip

This is a patch to restructrue the scenario tests to use the
new skip_if_not_implemented capability.

Change-Id: I49a7fb6650030f2a1115c6d42442062bd33415fd
diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index ec11f85..3f9efb5 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -44,6 +44,9 @@
             voting: false
         - octavia-v2-dsvm-cinder-amphora:
             voting: false
+        # Third party provider jobs
+        - neutron-ovn-provider-v2-scenario:
+            voting: false
     gate:
       fail-fast: true
       queue: octavia