VStorage driver can create volumes in multiple formats,
that are suitable for both virtual machines (qcow2) and
containers (ploop). To choose between volume formats the
vendor property vz:volume_format should be set in volume
type extra specs. Thus we need 2 volume types to support
both VMs and containers.
Change-Id: I7ffce9c16dfa524a3eac2e8d12ad7fd0b682eba6
Depends-On: Ib610e6f9c82259f9dd2db37178b24d964a38e20d
Signed-off-by: Pavel Glushchak <pglushchak@virtuozzo.com>