dbus-ptest: disable systemd

Explicitly disable systemd support so that it isn't a floating dependency and
libsystemd-login doesn't become a runtime dependency on non-systemd images.

Also don't bother setting the systemd unit directory as we're not installing
anything.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
shutdown-desktop: use poweroff for the Exec field in the shutdown.desktop

Use 'poweroff' instead of 'halt' for the Exec field in the shutdown.desktop.

The purpose of this patch is to make the 'shutdown' icon on on our sato
images work as expected for both sysvinit and systemd images. Previously,
the Exec field was 'halt'. The `halt' command could poweroff the system
in sysvinit images but it only could halt the system in systemd images.
The difference is due to the different implementations of the `halt' command.

In sysvinit, the `halt' command will effective execute `/sbin/init 0'. This
is for the compatibility with sysvinit 2.4, as stated in the comments of the
source code. In systemd, the `halt' command will effectively execute the
reboot(RB_HALT_SYSTEM).

As the 'shutdown' icon is expected to actually shutdown the system, we should
use poweroff instead of halt for its Exec field.

[YOCTO #4347]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
systemd-compat-units: remove dnsmasq from sysv disabled list

The dnsmasq recipe in meta-networking ships a dnsmasq.service file, that will
correctly override the SysV init script. Thus, as pointed out by Ross Burton,
we should remove dnsmasq from the list.

Signed-off-by: Anders Darander <anders@chargestorm.se>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>