fix(cgpt): Add GUID for resizeable STATE and alias for /usr

Add a new type to identify resizeable partitions to be more conservative
about what we modify on boot. Avoids surprising people who manually
modified the partition table.

In the future the CoreOS rootfs will instead be /usr. Add an alias so
scripts can use a more sensible looking partition type for /usr.
To avoid needless churn in update_engine the GUID remains the same.
2 files changed