I was overwriting the symbolic link /etc/sysconfig/selinux rather than
the actual destination /etc/selinux/config. This caused my changes to not
take effect because /etc/selinux/config is the only file that matters.
Remove the loopdevice at the end so we can run the script more
than once as the device is actually the host loopback device.
Update to now set the selinux contexts of the files we create. Also
use variables to hold the locations of the files.
Update the vendor-data to match what the current DO infrastructure is
putting out and update the user-data to match what we need to give.