fix(hotplugd.socket): remove basic.target as dependency

In 62ace19 we moved cloud-init-hotplugd.socket earlier in boot,
after cloud-config.target. But we didn't remove the dependencies added
by default and this might conflict with other units producing
non-solvable ordering cycles, see #2081124.

Remove the default dependency on basic.target added by systemd.

LP: #2081124

systemd/cloud-init-hotplugd.socket

@@ -5,6 +5,9 @@
 # Known bug with an enforcing SELinux policy: LP: #1936229
 [Unit]
 Description=cloud-init hotplug hook socket
+DefaultDependencies=no
+Before=shutdown.target
+Conflicts=shutdown.target
 After=cloud-config.target
 ConditionPathExists=!/etc/cloud/cloud-init.disabled
 ConditionKernelCommandLine=!cloud-init=disabled