`quota` is not working on latest kernel if running command not from / on simfs

`quota` is not working on latest kernel if running command not from /
when CT created on simfs


>Steps to Reproduce:
vzctl enter 1234
```
[root@test2 /]# useradd ttt

[root@test2 /]# setquota -u ttt 100000000000000 100000000000000 100000000000000 100000000000000 -a

[root@test2 /]#

[root@test2 /]# quota ttt
Disk quotas for user ttt (uid 500):
     Filesystem blocks quota limit grace files quota limit grace
          simfs 16 100000000000000 100000000000000 5 276447232 276447232

[root@test2 /]# cd
[root@test2 ~]# quota ttt
quota: Cannot stat() mounted device simfs: No such file or directory

[root@test2 ~]# su - root
[root@test2 ~]# quota ttt
quota: Cannot stat() mounted device simfs: No such file or directory
[root@test2 ~]# cd /
[root@test2 /]# quota ttt
Disk quotas for user ttt (uid 500):
     Filesystem blocks quota limit grace files quota limit grace
          simfs 16 100000000000000 100000000000000 5 276447232 276447232

>Expected results:
this command should run from any folder, as it was earlier, for example for 2.6.32-042stab108.8

>Host OS:

2.6.32-042stab113.11

>Guest OS:

OS template does not matter (tested with latest ubuntu 14.04 and centos 6)
CT should be on simfs
Everething looks fine on ploop

Same with setquota and repquota:

# cd /some/path
# repquota /
repquota: Cannot stat() mounted device simfs: No such file or directory
repquota: Cannot stat() mounted device simfs: No such file or directory
repquota: Cannot stat() mounted device simfs: No such file or directory
repquota: Mountpoint (or device) / not found or has no quota enabled.
repquota: Not all specified mountpoints are using quota.