fix(systemd): add Before=shutdown.target to cloud-init-main.service.t…

…mpl (#5653)

Fixes lintian warning systemd-service-file-shutdown-problems. See [1,
2].

Remove superflous conditional additions of Conflicts=shutdown.target as
it is unconditionally added for every target.

[1] https://salsa.debian.org/lintian/lintian/-/blob/2.118.0/tags/s/systemd-service-file-shutdown-problems.tag
[2] systemd/systemd#11821

systemd/cloud-init-main.service.tmpl

@@ -17,16 +17,15 @@ Requires=dbus.socket
 After=dbus.socket
 Before=network.service
 Before=firewalld.target
-Conflicts=shutdown.target
 {% endif %}
 {% if variant in ["ubuntu", "unknown", "debian"] %}
 Before=sysinit.target
-Conflicts=shutdown.target
 {% endif %}
 
 After=systemd-remount-fs.service
 Before=sysinit.target
 Before=cloud-init-local.service
+Before=shutdown.target
 Conflicts=shutdown.target
 RequiresMountsFor=/var/lib/cloud
 ConditionPathExists=!/etc/cloud/cloud-init.disabled