Drop the support for remote clients to generate systemd-service files.
The generated files are machine-dependent and hence relate only to the
a local machine. Furthermore, a proper service management when using
a remote-client is not possible as systemd has no access to a process.
Dropping the support will also reduce the risk of making users believe
that the generated services are usable in a remote scenario.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>