PSA: Xposed now possible on locked bootloaders

We have Xposed working on locked bootloaders now guys! Thanks to @tabp0le for the awesome guide!
As of right now its only confirmed to work on these variants, but it should work for all. We just need more people to confirm.

Confirmed working on:
LS991 (Sprint) confirmed by @tabp0le
H810 (AT&T) confirmed by @djkinetic & @uly609
H815L confirmed by @AvivEliyahu
H815 SEA confirmed by @BySezerSimsek