Description of problem:
Anaconda errors out when it runs out of mirrors to try and calls it an unrecoverable error. (Error 256)


How reproducible: 
When on a poor internet connection (occasionally loses connection), most of the time.


Steps to Reproduce:
1. Have an internet connection that will disconnect from time to time.
2. Run the installer (I was using BFO, should do the same with netinstall).

Actual results:
Installation errored out.

Expected results:
Installation errors out with an option to retry download.

Additional info:
Try running in the terminal (CTRL+ALT+F2):

    while true; do anaconda-yum <options from tty>; done # This will continually run the anaconda-yum installer, and that appears to resume downloads where it left off, which indicates that there could be restart functionality. Needs to be exited with CTRL+c.
    chroot /mnt/sysimage # in order to install and configure grub, and to set a root password for the install system.
    grub2-install /dev/sda && grub2-mkconfig /boot/grub2/grub.cfg # Installs grub so that it can be booted. May need to change for EFI setups.
    passwd # Pick a root password.
    exit # get out of chroot
    reboot # reboot to new, installed system.