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
1 file changed