[ale] SW root for Amazon Fire 8HD gen-7 possible

[DJ-Pfulio]

Seems someone found a software root last week, 26th, for the 2017 Amazon
Fire 8HD tablets, finally! It provides a temporary root with SELinux
disabled.

It is 3-5 commands, depending on your existing developer options. In
short, freakin' easy.

https://forum.xda-developers.com/hd8-hd10/general/discussion-root-progress-fire-hd-8-t3743024/page104

Tested it. Working here.  YMMV. Be careful and don't brick yours.

All I've done so far is replace the 1 line /etc/hosts with my 131K line
anti-tracking variant. Verified that the worst tracking sites weren't
available, then rebooted the tablet and verified they still weren't
available.

I may want to install a real firewall and busybox shortly, but haven't
at this point.
I did not install SuperSU.