Fix partition selection for disks where partition numbers don't match physical order

add support for virtio block devices (/dev/vd)

Fix resizing of /dev/mmcblk0pN paths

Update go.mod name, docs, x/sys dep

Support nvme devices.

recognize linux GUID partition type

fix Errorf format string

Ignore trailing zero partitions.

Ignore rootfs, use blkid to find partition type if sfdisk doesn't report.

Fix /sbin/sfdisk hanging indefinitely

integration test: resize disk

Update go.mod

integration test: quit qemu instead of having init exit. cleaner output.

integration tests: use reflection to register the in-qemu tests

Integration test: better lsblk parsing, pass -test.run to kernel.