dbus: extract 'dbus-tools' from 'dbus-daemon'
    
    Create a new sub-package called 'dbus-tools', which includes all the
    independent command-line utilities provided by the reference
    implementation. They are valid to be used with independent bus
    implementations, so no reason to make them pull in dbus-daemon.
    
    Signed-off-by: David Herrmann <dh.herrmann@gmail.com>