OCPBUGS-34493: baremetal: Don't always enable provisioning-interface.service

In the baremetal bootstrap it is not sufficient to make ironic.service
conditionally Require provisioning-interface.service, as
104eae1 attempted to do, when the
latter is already enabled because it is WantedBy multi-user.target. As
long as it is enabled, systemd will try to start it.

Do not install provisioning-interface.service, so that it will only be
enabled when ironic.service requires it (i.e. when the provisioning
network is not disabled).

Author: zaneb

data/data/bootstrap/baremetal/systemd/units/provisioning-interface.service.template

@@ -16,4 +16,3 @@ Restart=on-failure
 RestartSec=10
 
 [Install]
-WantedBy=multi-user.target