UBUNTU: [Packaging] bind hv_kvp_daemon startup to hv_kvp device

BugLink: https://bugs.launchpad.net/bugs/1820063

The hv_kvp_daemon service requires the hv_kvp device and should
be started when the device appears and stopped in it disappears.
Solution is based off the one provided at
https://bugzilla.redhat.com/show_bug.cgi?id=1195029#c22.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Acked-by: Kleber Souza <kleber.souza@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

debian/linux-cloud-tools-common.hv-kvp-daemon.service

@@ -5,7 +5,8 @@
 Description=Hyper-V KVP Protocol Daemon
 ConditionVirtualization=microsoft
 DefaultDependencies=no
-After=systemd-remount-fs.service
+BindsTo=sys-devices-virtual-misc-vmbus\x21hv_kvp.device
+After=sys-devices-virtual-misc-vmbus\x21hv_kvp.device systemd-remount-fs.service
 Before=shutdown.target cloud-init-local.service walinuxagent.service
 Conflicts=shutdown.target
 RequiresMountsFor=/var/lib/hyperv

debian/linux-cloud-tools-common.hv-kvp-daemon.udev

+SUBSYSTEM=="misc", KERNEL=="vmbus/hv_kvp", TAG+="systemd", ENV{SYSTEMD_WANTS}+="hv-kvp-daemon.service"

debian/rules.d/3-binary-indep.mk

@@ -199,6 +199,7 @@ ifeq ($(do_tools_hyperv),true)
 	dh_installinit -p$(cloudpkg) -n --name hv-kvp-daemon
 	dh_installinit -p$(cloudpkg) -n --name hv-vss-daemon
 	dh_installinit -p$(cloudpkg) -n --name hv-fcopy-daemon
+	dh_installudev -p$(cloudpkg) -n --name hv-kvp-daemon
 	dh_systemd_enable -p$(cloudpkg)
 	dh_installinit -p$(cloudpkg) -o --name hv-kvp-daemon
 	dh_installinit -p$(cloudpkg) -o --name hv-vss-daemon