vzctl 4.9.4-1 mess container layout on debian wheezy

>Description of problem:

After installation of vzctl 4.9.4-1 on Debian Wheezy ploop snaphosts not working any more.

>How reproducible:

Always

>Steps to Reproduce:
1. Install vzctl 4.9.1-1

2. Set VE_LAYOUT=simfs in /etc/vz/vz.conf

3. Create container with ploop layout:
# vzctl create 1000 --ostemplate debian-7.0-minimal --config vswap-2g --layout ploop --diskspace 10g

4. Check ploop support
# vzlist -o ctid,layout
1000 ploop
# vzctl snapshot-list 1000

5. Install vzctl 4.9.4-1
5. Recheck ploop support
# vzlist -o ctid,layout
1000 simfs
# vzctl snapshot-list 1000
Snapshot feature is only available for ploop-based CTs


>Actual results:

# vzctl snapshot-list 1000
Snapshot feature is only available for ploop-based CTs

>Expected results:
Snapshots should work after vzctl upgrade.

>Host OS:
Debian Wheezy 7.9 amd64

>Guest OS:
Debian Wheezy 7.9 amd64

Problem exists due to added option in /etc/vz/conf/1000.conf during vzctl upgrade:
# Upgrade Thu Sep 10 12:01:51 MSK 2015: Securing CT config by adding VE_LAYOUT=simfs
VE_LAYOUT=simfs