Drop validation of service name which is not implemented for
the other daemons, to simplify handling of the provided service name.
This allows us to more easily offload the service name definition to
hiera data in the near future.
Change-Id: I90a78929510ca3917d3ba32576fa123d512388b9
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>