[CI]nova-alt-configurations tests eventlet

This patch renames the nova-ovs-hybrid-plug Job to
nova-alt-configurations and ensures that all nova services are
running with eventlet even after some of the services switches to
native threading by default. This ensures we keep eventlet test
coverage in place.

Change-Id: Id2b70aa3870f2bf5a28c875a7564f84c012c9456
Signed-off-by: Balazs Gibizer <gibi@redhat.com>

.zuul.yaml

@@ -139,7 +139,7 @@
     post-run: playbooks/nova-live-migration/post-run.yaml
 
 - job:
-    name: nova-ovs-hybrid-plug
+    name: nova-alt-configurations
     parent: tempest-multinode-full-py3
     nodeset: devstack-two-node-debian-bookworm
     description: |
@@ -148,6 +148,9 @@
       the "iptables_hybrid" securitygroup firewall driver, aka "hybrid plug".
       The external events interactions between Nova and Neutron in these
       situations has historically been fragile. This job exercises them.
+      This job also explicitly sets eventlet mode for all nova services to keep
+      testing eventlet mode even after the default is set to native threading
+      for some services.
     irrelevant-files: &nova-base-irrelevant-files
       - ^api-.*$
       - ^(test-|)requirements.txt$
@@ -175,6 +178,12 @@
         Q_ML2_PLUGIN_MECHANISM_DRIVERS: openvswitch
         ML2_L3_PLUGIN: router
         NOVA_VNC_ENABLED: False
+        'SYSTEMD_ENV_VARS["n-sch"]': OS_NOVA_DISABLE_EVENTLET_PATCHING=false
+        'SYSTEMD_ENV_VARS["n-api"]': OS_NOVA_DISABLE_EVENTLET_PATCHING=false
+        'SYSTEMD_ENV_VARS["n-api-meta"]': OS_NOVA_DISABLE_EVENTLET_PATCHING=false
+        'SYSTEMD_ENV_VARS["n-cond-cell1"]': OS_NOVA_DISABLE_EVENTLET_PATCHING=false
+        'SYSTEMD_ENV_VARS["n-super-cond"]': OS_NOVA_DISABLE_EVENTLET_PATCHING=false
+        'SYSTEMD_ENV_VARS["n-cpu"]': OS_NOVA_DISABLE_EVENTLET_PATCHING=false
       devstack_services:
         # Disable OVN services
         br-ex-tcpdump: false
@@ -225,6 +234,7 @@
           ML2_L3_PLUGIN: router
           NOVA_VNC_ENABLED: False
           NOVA_SPICE_ENABLED: true
+          'SYSTEMD_ENV_VARS["n-cpu"]': OS_NOVA_DISABLE_EVENTLET_PATCHING=false
         devstack_services:
           # Disable OVN services
           br-ex-tcpdump: false
@@ -821,7 +831,7 @@
         - nova-lvm
         - nova-multi-cell
         - nova-next
-        - nova-ovs-hybrid-plug
+        - nova-alt-configurations
         - nova-tox-validate-backport:
             voting: false
         - nova-tox-functional-py310
@@ -877,6 +887,7 @@
         - openstacksdk-functional-devstack:
             irrelevant-files: *nova-base-irrelevant-files
         - nova-tox-py312-threading
+        - nova-alt-configurations
     periodic-weekly:
       jobs:
         # Runs emulation feature functionality test less frequently due