Don't call storage.write for dirinstall (#1120206)
    
    The logic got slightly corrupted with the ostree patches. With this fix
    you can do:
    
    anaconda --text --dirinstall --kickstart=./path/to/ks.cfg
    
    to get an installed system in /mnt/sysimage/
    
    Related: rhbz#1120206
    (cherry picked from commit edb7da857895b59e1b0fceda6bc0320ab3ca50fd)