Make support/policyvers.py compatible with Python 3

Add parenthesis around print statement, like in other Python scripts.
Make unconfined user run lvm programs in confined domain

When an unconfined user uses truecrypt to mount an encrypted file, dmsetup is
called to setup a new device.  This program works with udev to configure the
new device and uses SysV semaphores to synchronize states.  As udev runs
dmsetup in lvm_t domain, the first dmsetup process needs to create lvm_t
semaphores (not unconfined_t) and hence needs to run in lvm_t domain.

More details are available in the archives on the ML:
http://oss.tresys.com/pipermail/refpolicy/2014-May/007111.html
Module version bump for unconfined->lvm transition from Nicolas Iooss.
Need the __future__ import for python2 if using print().
Merge upstream