Disable uWSGI usage by default

While we are supposed to move Neutron fully to uWSGI usage from current
eventlet for 2024.2 release, in order to make change backportable we
are disabling uWSGI usage for Neutron API by default as it requires
more services to run, which were added just for 2024.2 cycle.

All prior releases are still expected to run old eventlet version to
avoid any potenital issues.

[1] https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack.org/thread/SVP3VUCOZGIY63TGD33H6NQ6UBAFDN5V/

Change-Id: I5bea4bf1946f9788d9d87561da15c3abdcba1993
(cherry picked from commit 63900b617dbc58cc1d80cc73523f52142fcd0b0d)

defaults/main.yml

@@ -190,7 +190,7 @@ neutron_ovn_metadata_agent_init_overrides: {}
 ### UWSGI
 ###
 # NOTE(noonedeadpunk): uWSGI is still not fully supported. See: https://bugs.launchpad.net/neutron/+bug/1912359
-neutron_use_uwsgi: "{{ (neutron_plugin_type not in ['ml2.ovn']) }}"
+neutron_use_uwsgi: False
 neutron_wsgi_processes_max: 16
 neutron_wsgi_processes: "{{ [[ansible_facts['processor_vcpus'] | default(1), 1] | max * 2, neutron_wsgi_processes_max] | min }}"
 neutron_wsgi_threads: 1

releasenotes/notes/disable_neutron_uwsgi_default-1763a0cbc17f23c8.yaml

@@ -0,0 +1,13 @@
+---
+upgrade:
+  - |
+    Default for Neutron API has been switched from using uWSGI to old
+    eventlet due to found compatability issues for the current OpenStack
+    release.
+    You can find more infromation in Neutron
+    `bug report <https://bugs.launchpad.net/neutron/+bug/2069581>`_
+    You can preserve current behaviour by setting ``neutron_use_uwsgi: True``
+fixes:
+  - |
+    In case of switching Neutron from uWSGI to old eventlet,
+    `neutron-rpc-server` service will be disabled and stopped by the role.

vars/main.yml

@@ -482,7 +482,9 @@ neutron_services:
   neutron-rpc-server:
     group: neutron_server
     service_name: neutron-rpc-server
-    service_en: "{{ neutron_use_uwsgi }}"
+    service_en: True
+    enabled: "{{ neutron_use_uwsgi }}"
+    state: "{{ neutron_use_uwsgi | ternary('started', 'stopped') }}"
     init_config_overrides: "{{ neutron_rpc_server_init_overrides | combine(neutron_server_init_overrides) }}"
     start_order: 2
     execstarts: >-