Switch neutron-tempest-plugin-api job to be uwsgi based

Test of uwsgi based deployment is most important on the API
level, so this patch switches neutron-tempest-plugin-api job to
run neutron with uwsgi there.
Thanks to that we will also drop neutron-tempest-with-uwsgi
which is defined in the neutron repo from neutron CI queues.

Change-Id: If34ed0bd65a2eedae85894d80fb4f47eedef0165
diff --git a/zuul.d/train_jobs.yaml b/zuul.d/train_jobs.yaml
index a0402d8..0785924 100644
--- a/zuul.d/train_jobs.yaml
+++ b/zuul.d/train_jobs.yaml
@@ -81,6 +81,7 @@
       network_available_features: &available_features
         -
       devstack_localrc:
+        NEUTRON_DEPLOY_MOD_WSGI: false
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_tempest) | join(',') }}"
 
 - job: