Code review comment for lp:~jamesodhunt/snappy/add-lsblk-cache

I looked into the lsblk issue this morning and it seems like thats the place we can fix the underlying issue.

The problem appears to be that we do not build util-linux with libudev-dev as a build-dependency which means that the partition label is not visible for non-root-users. When libudev-dev is added it will show partition labels even for non-root users (udevadm info -x /dev/sda3 confirms that the partition label info is available via udev).

I uploaded https://launchpadlibrarian.net/196449981/util-linux_2.25.2-4ubuntu1_2.25.2-4ubuntu1%2Bppa1.diff.gz into the PPA and will push this change to vivid once I got feedback from upstream.