Move check-tempest-dsvm-neutron-dvr to check queue

The job has become fairly stable (e.g. [1]) and the last persistent
failure is addressed in [2]. We can start running it on each Neutron
change, even though it will still be a non-voting job.

[1] - http://logs.openstack.org/54/115754/9/experimental/check-tempest-dsvm-neutron-dvr/7c8f283/
[2] - https://review.openstack.org/#/c/116377/

Change-Id: I1fc49285f9493ea9e9f9b2ad3b337d60a81e1368
Merge "Move check-tempest-dsvm-neutron-dvr to check queue"