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
* Don't ask for the mesa driver when the Qemu arch is not the
native arch and always use swrast in that case
* qemu-vexpress: use LTS kernel
* qemu-aarch64: use drm-backend for weston