dbus: extract 'dbus' package into 'dbus-daemon'
    
    This extracts all the contents of the 'dbus' package into a new
    'dbus-daemon' package. All internal sub-package dependencies are
    updated to point to the new sub-package. The original 'dbus' package is
    kept around as empty meta-package that simply pulls in 'dbus-daemon'.
    This is meant for compatibility so other packages continue working for
    now. Dependencies on 'dbus' will be reviewed and updated before this
    meta-package gets removed.
    
    This package rename prepares Fedora to allow alternative
    implementations of D-Bus System and Session buses. The 'dbus' package
    name is freed from dependencies on any particular implementation.
    Instead, the reference implementation is now called 'dbus-daemon' as a
    package, with the intent to re-use the 'dbus' package name in the
    future as a meta-name provided by 'dbus-daemon' as well alternative
    implementations like 'dbus-broker'. It will serve as dependency of
    dbus-only services to clearly tell rpm that a dbus system or user bus
    implementation is required for a given package.
    
    Signed-off-by: David Herrmann <dh.herrmann@gmail.com>