spec: More RHEL merging
    
    * Add tools_only path to only build qemu-img and qemu-guest-agent
    * Add a -tests subpackage
    * Install tracetool, simpletrace, dump-guest-memory
    * Add vhost modprobe file
    * Sync qemu-guest-agent file lists
    * Use udevrulesdir from systemd
    * Add more seabios and seavgabios roms
    * More use of %{name} to make paths more generic
    * Group all fedora specific %install content at the end
    * Drop the rpath stripping, in my testing it's not needed anymore
    * Drop the s390x iotests skippage from last year
    
    Signed-off-by: Cole Robinson <crobinso@redhat.com>