rpm: Reduce use of with_modular_daemons

rpm: Reduce use of with_modular_daemons

The current implementation pretty much assumes that targets
where modular daemons are the default will stick with that
configuration, as will targets where they're not, or that
changes to these defaults will be performed by the admin after
the packages have been installed.

This is unnecessarily limiting: for example, on a target that
defaults to using the monolithic daemon, it's entirely possible
to create a local preset such as

  # /etc/systemd/system-preset/00-virt.preset
  disable libvirtd.service
  disable libvirtd*.socket
  enable virtqemud.service

to opt into a modular daemon deployment. The opposite is of
course also true. We shouldn't get in the way of these
reasonable use cases.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>