Comment 5 for bug 1636531

Validated no /sbin/blkid leaks from altcloud unit tests in xenial:

$ name=test-proposed
$ release=xenial
$ ref=$release-proposed
$ ./lxc-proposed-snapshot --proposed --publish $release $ref
$ lxc init $ref $name
Creating test-proposed
$ lxc exec $name -- git clone -b ubuntu/xenial https://git.launchpad.net/cloud-init;
...
$ lxc exec $name bash
root@test-proposed:~/cloud-init# tox -e py27 tests/unittests/test_datasource/test_altcloud.py | grep 'LEAKED BLKID'
# None reported
root@test-proposed:~/cloud-init# /sbin/blkid
LEAKED BLKID CALL
$ lxc exec $name -- dpkg -l cloud-init
ii cloud-init 0.7.9-113-g5 all Init scripts for cloud instances