Add Hyper-V KVP Daemon to Azure Stemcells (#453)

* Add hvperv-kv daemon for Azure stemcells

Azure runs on the Hyper-V hypervisor, and Linux VMs rely on Linux Integration
Services (LIS) to communicate with the host. These services include kernel
modules (like hv_utils) and daemons (hv_kvp_daemon, hv_vss_daemon, etc.) that
handle:

- Host-to-guest communication
- IP address reporting
- VM metadata exchange
- Backup coordination (via VSS)

The hv_kvp_daemon specifically manages key-value pair exchange between the
Azure host and the Linux guest. If the daemon is missing, Azure may not
be able to retrieve guest metadata (e.g., hostname, IP address) This can
affect Azure Resource Graph queries, scripts that rely on guest-reported
data, backup and monitoring tools that use KVP for coordination

cloud-init writes warnings about events that could not be sent to hv-kvp:

```txt
$ grep kvp /var/log/cloud-init.log
failed to truncate kvp pool file, [Errno 2] No such file or directory: '/var/lib/hyperv/.kvp_pool_1'
failed posting events to kvp, [Errno 2] No such file or directory: '/var/lib/hyperv/.kvp_pool_1'
```

* Add missing tests for waagent.service

* Consolidate Azure package installs

Author: s4heid

bosh-stemcell/spec/stemcells/azure_spec.rb

@@ -79,4 +79,40 @@
       its(:content) { should match /Unmanaged=yes/ }
     end
   end
+
+  context 'installed by system_azure_init', {
+    exclude_on_alicloud: true,
+    exclude_on_aws: true,
+    exclude_on_google: true,
+    exclude_on_vcloud: true,
+    exclude_on_vsphere: true,
+    exclude_on_warden: true,
+    exclude_on_openstack: true,
+    exclude_on_softlayer: true,
+  } do
+    describe 'Hyper-V KVP daemon' do
+      describe command('which hv_kvp_daemon') do
+        its(:exit_status) { should eq 0 }
+      end
+
+      describe service('hv-kvp-daemon') do
+        it { should be_enabled }
+      end
+    end
+
+    describe 'WALinuxAgent configuration' do
+      describe file('/etc/waagent.conf') do
+        it { should be_owned_by('root') }
+      end
+
+      describe file('/lib/systemd/system/walinuxagent.service') do
+        it { should be_mode(0644) }
+        it { should be_owned_by('root') }
+      end
+
+      describe service('walinuxagent') do
+        it { should be_enabled }
+      end
+    end
+  end
 end

stemcell_builder/stages/system_azure_init/apply.sh

@@ -5,7 +5,8 @@ set -e
 base_dir=$(readlink -nf $(dirname $0)/../..)
 source $base_dir/lib/prelude_apply.bash
 
-packages="python3 python3-pyasn1 python3-setuptools python3-distro python-is-python3 cloud-init"
+packages="python3 python3-pyasn1 python3-setuptools python3-distro python-is-python3 \
+cloud-init linux-cloud-tools-common linux-cloud-tools-generic"
 pkg_mgr install $packages
 
 wala_release=2.14.0.1
@@ -66,3 +67,6 @@ cat $chroot/etc/rsyslog.d/21-cloudinit.conf >> $chroot/etc/rsyslog.d/50-default.
 
 rm $chroot/etc/rsyslog.d/21-cloudinit.conf
 
+
+# Enable Hyper-V KVP daemon (installed via linux-cloud-tools)
+run_in_chroot "$chroot" "systemctl enable hv-kvp-daemon.service"