Switched from q-dns to neutron-dns service name

The q-* service names make devstack use old lib/neutron-legacy library
to configure neutron services. We plan to swith to the new lib/neutron
library, and it's a requirement that no services with q-* names are
present in ENABLED_SERVICES to make it happen.

The neutron devstack plugin handles both names identically, so there
should be no functional change after the patch is merged.

Change-Id: Ic5100cd2f12b729149350e3ccb0aba7844b18d2c
diff --git a/.zuul.yaml b/.zuul.yaml
index ba7e158..5b9e94a 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -76,7 +76,7 @@
       devstack_services:
         cinder: False
         designate: True
-        q-dns: True
+        neutron-dns: True
         tempest: True
       tempest_test_regex: '^neutron_tempest_plugin\.scenario\.test_dns_integration'
       tox_venvlist: all-plugin