Don't run legacy-tempest-dsvm-neutron-full on non-code nova changes
Don't run legacy-tempest-dsvm-neutron-full on non-code nova changes

As of change I5d34e5b983b720dc1913d00ccc1a16d81a040d49 we are
running this job in stable branches for nova changes again, but
we need to ignore it for non-code changes like the other dsvm jobs.

Change-Id: Ib1e86f4d3b62b0ca7318e5ee1a192f880b8bba83

openstack-infra/project-config,openstack-infra/project-config