update nova-next to use ubuntu 24.04

This change updates the nova-next nodeset
to use openstack-two-node-noble and revert to
using qemu without nested virt.

using nested virt was a tempory messure to mitigate the kernel
panics we were seeing related to volume detach while we also explored
using split kernel images. since then we have reverted the other
jobs back to using normal whole disk images and we have not
seen a marked uptic in kernel panics.

as such this change drop the use of nested virt since the other jobs
are not using it an updates the nodeset to move nova-next to test on
ubuneu 24.04 (noble) on python 3.12

Depends-On: https://review.opendev.org/c/openstack/devstack/+/922427
Change-Id: I5059ba3c519efb18947a8f3d24868ce1c9289e3d

.zuul.yaml

@@ -386,34 +386,7 @@
     pre-run: playbooks/nova-next/pre.yaml
     required-projects:
         - novnc/novnc
-    nodeset:
-      nodes:
-        - name: controller
-          label: nested-virt-ubuntu-jammy
-        - name: compute1
-          label: nested-virt-ubuntu-jammy
-      groups:
-        # Node where tests are executed and test results collected
-        - name: tempest
-          nodes:
-            - controller
-        # Nodes running the compute service
-        - name: compute
-          nodes:
-            - controller
-            - compute1
-        # Nodes that are not the controller
-        - name: subnode
-          nodes:
-            - compute1
-        # Switch node for multinode networking setup
-        - name: switch
-          nodes:
-            - controller
-        # Peer nodes for multinode networking setup
-        - name: peers
-          nodes:
-            - compute1
+    nodeset: openstack-two-node-noble
     vars:
       # We use the "all" environment for tempest_test_regex and
       # tempest_exclude_regex.
@@ -482,8 +455,7 @@
             neutron_plugin_options:
               available_type_drivers: flat,geneve,vlan,gre,local,vxlan
       devstack_localrc:
-        # For nested virt
-        LIBVIRT_TYPE: kvm
+        LIBVIRT_TYPE: qemu
         Q_AGENT: openvswitch
         Q_ML2_TENANT_NETWORK_TYPE: vxlan
         Q_ML2_PLUGIN_MECHANISM_DRIVERS: openvswitch
@@ -527,8 +499,7 @@
     group-vars:
       subnode:
         devstack_localrc:
-          # For nested virt
-          LIBVIRT_TYPE: kvm
+          LIBVIRT_TYPE: qemu
           Q_AGENT: openvswitch
           Q_ML2_TENANT_NETWORK_TYPE: vxlan
           Q_ML2_PLUGIN_MECHANISM_DRIVERS: openvswitch

devstack/lib/mdev_samples

@@ -18,9 +18,9 @@ function compile_mdev_samples {
     else
         sudo tee -a /etc/apt/sources.list <<EOF
 # Added by devstack
-deb-src http://archive.ubuntu.com/ubuntu jammy main restricted
-deb-src http://archive.ubuntu.com/ubuntu jammy-updates main restricted
-deb-src http://archive.ubuntu.com/ubuntu jammy-security main restricted
+deb-src http://archive.ubuntu.com/ubuntu $DISTRO main restricted
+deb-src http://archive.ubuntu.com/ubuntu $DISTRO-updates main restricted
+deb-src http://archive.ubuntu.com/ubuntu $DISTRO-security main restricted
 EOF
     fi