test/Vagrantfile: disable unattended-upgrades

CI runs occasionally fail with errors similar to:

    Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource
        temporarily unavailable)
    Unable to acquire the dpkg frontend lock
        (/var/lib/dpkg/lock-frontend), is another process using it?

This lock is typically held by dpkg or apt when they check for or
proceed to updates. The two main suspects are usually:

- An aborted run of dpkg or apt, that would not have released the lock
  on exit, or
- Automatic updates running in the background, for example with the
  unattended-upgrades package.

The logs did not raise any previous apt failure. Automatic updates may
well be responsible for the lock being held. We do not want them running
on test machines anyway, so let's disable unattended-updates altogether.

This should be moved directly to the CI images in the future; the
current patch is a quick fix so we can stop the CI failures as soon as
possible.

Signed-off-by: Quentin Monnet <quentin@isovalent.com>

test/Vagrantfile

@@ -67,6 +67,12 @@ Vagrant.configure("2") do |config|
         # Provision section
         server.vm.provision :shell,
             :inline => "sed -i 's/^mesg n$/tty -s \\&\\& mesg n/g' /root/.profile"
+        # Disable unattended-upgrades to prevent it from holding the dpkg frontend lock
+        # To be removed once this has been added through packer-ci-build
+        server.vm.provision :shell,
+            :inline => "sudo systemctl disable unattended-upgrades.service"
+        server.vm.provision :shell,
+            :inline => "sudo systemctl stop unattended-upgrades.service"
         server.vm.provision "file", source: "provision/", destination: "/tmp/"
         server.vm.provision "shell" do |sh|
             sh.path = "./provision/runtime_install.sh"
@@ -127,6 +133,12 @@ Vagrant.configure("2") do |config|
                 :inline => "sudo sysctl -w net.ipv6.conf.all.forwarding=1"
             server.vm.provision :shell,
                 :inline => "sed -i 's/^mesg n$/tty -s \\&\\& mesg n/g' /root/.profile"
+            # Disable unattended-upgrades to prevent it from holding the dpkg frontend lock
+            # To be removed once this has been added through packer-ci-build
+            server.vm.provision :shell,
+                :inline => "sudo systemctl disable unattended-upgrades.service"
+            server.vm.provision :shell,
+                :inline => "sudo systemctl stop unattended-upgrades.service"
             server.vm.provision "file", source: "provision/", destination: "/tmp/"
             server.vm.provision "shell" do |sh|
                 sh.path = "./provision/k8s_install.sh"