Update to anaconda-34.25.1.6
    
    - Report registration errors from kickstart (mkolman)
      Resolves: rhbz#2000652
    - GUI: Show the dialog for a missing passphrase in an enlight box (vponcova)
      Related: rhbz#2087218
    - GUI: Ask for a missing passphrase during automated installations (vponcova)
      Resolves: rhbz#2087218
    - Create functions for a missing passphrase in pyanaconda.ui.lib (vponcova)
      Related: rhbz#2087218
    - Add missing period when concatenating password error strings (jkonecny)
      Resolves: rhbz#2075417
    - Enable bootloader hiding on RHEL (rharwood)
      Resolves: rhbz#2059414