Use nova zuulv3 job for nova v2 API

Nova has migrated the legacy-tempest-dsvm-nova-v20-api
job to zuulv3 native - "nova-tempest-v2-api"

This commit use the new job in tempest gate.

Change-Id: I81a07d8fbb529b0ac55ce40c50a6e5348e1f43df
diff --git a/.zuul.yaml b/.zuul.yaml
index 2bec8c4..efb9fde 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -618,7 +618,7 @@
             irrelevant-files: *tempest-irrelevant-files
         - nova-cells-v1:
             irrelevant-files: *tempest-irrelevant-files
-        - legacy-tempest-dsvm-nova-v20-api:
+        - nova-tempest-v2-api:
             irrelevant-files: *tempest-irrelevant-files
         - legacy-tempest-dsvm-lvm-multibackend:
             irrelevant-files: *tempest-irrelevant-files