Some platforms do not have grub2, and some require other partitions.
Anaconda will add platform specific partitions if the 'reqpart' command
is included, and it will add bootloader specific packages to the list if
they are needed.
This is required to ensure that SELinux is configured properly while
building. It fixes the problem with building tar, and should be
installed in the other image types for consistency.
Resolves: rhbz#1645189
Since these images can be used to create multiple machines, they should
not have a unique machine-id attached to them. Replace /etc/machine-id
with an empty file so that it will be regenerated at boot time.
