This is required for kernels earlier than 4.7 for bwrap to work for
normal users, and therefore for gnome web (epiphany) and flatpak.
[ci:skip-build] [ci:ignore-count]
Prepare for better device categorization by moving everything to testing
subdir first.
[skip-ci]: chicken-egg problem: passing pmaports CI depends on pmbootstrap MR
depends on this MR
Related: postmarketos#16