Adjust qemu package name for Ubuntu Noble (24.04)

qemu package was renamed to qemu-system package in Ubuntu Noble (24.04)
so update the package name accordingly.

Also make manila-image-elements-buildimage-docker non-voting now,
because job rarely passes now due to reatelimit in docker.io .

Change-Id: I40a71159cc0385e1236151bd33070adab9693e4c

bin/manila-image-create

@@ -167,7 +167,7 @@ is_installed() {
 need_required_packages() {
     case "$platform" in
         "ubuntu")
-            package_list="qemu kpartx debootstrap"
+            package_list="qemu-system kpartx debootstrap"
             ;;
         "fedora")
             package_list="qemu-img kpartx debootstrap"

zuul.d/project.yaml

@@ -6,7 +6,8 @@
       jobs:
         - openstack-tox-pep8
         - manila-image-elements-buildimages
-        - manila-image-elements-buildimage-docker
+        - manila-image-elements-buildimage-docker:
+            voting: false
         - manila-image-elements-container-scenario:
             voting: false
             irrelevant-files: &irrelevant-files