system-helper: Allow configuration of dbus configuration directory

Newer versions of dbus support stateless directories, and many distributions
now use /usr/share/dbus-1/system.d for the vendor configuration files, as
opposed to the legacy /etc/dbus-1/system.d directory.

To enable this, we add a new --with-dbus-config-dir option to control the
configuration directory, whilst retaining backwards compatibility for those
still using older versions of dbus.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>
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