[WSGI] Keep eventlet server for older versions of NDR

Related-Bug: #2069581
Topic: eventlet-deprecation
Change-Id: I76e1ec7d5a82ed6416b12b3866c70a0d3127eb24
diff --git a/zuul.d/wallaby_jobs.yaml b/zuul.d/wallaby_jobs.yaml
index 56ed2cf..740f916 100644
--- a/zuul.d/wallaby_jobs.yaml
+++ b/zuul.d/wallaby_jobs.yaml
@@ -248,6 +248,8 @@
     required-projects: *required-projects-wallaby
     vars:
       network_api_extensions_common: *api_extensions
+      devstack_localrc:
+        NEUTRON_DEPLOY_MOD_WSGI: false
 
 - job:
     name: neutron-tempest-plugin-vpnaas-wallaby