[Users] Virtuozzo7 - ext4 and vzpkg

[Axton]

Template creation fails if /var/tmp is xfs, which is the default file
system on RHEL7.  The documentation for installation does not highlight
this requirement for /var/tmp; it does for /vz though.  Reference:
https://openvz.org/Quick_installation

Here is the full output.  Resolved by formatting /var/tmp with ext4 instead
of xfs.

My version:
[root at cluster-02 ~]# rpm -q vztt
vztt-7.0.28-1.vz7.x86_64

[root at cluster-02 ~]# vzpkg update cache centos-7-x86_64
Update OS template cache for centos-7-x86_64 template
Cleaning repos: base0 base1 base2 base3
0 metadata files removed
0 sqlite files removed
0 metadata files removed
base0
                                    |  951 B  00:00:00
base1
                                    |  951 B  00:00:00
base2
                                    | 3.6 kB  00:00:00
base3
                                    | 3.4 kB  00:00:00
(1/8): base2/group_gz
                                    | 155 kB  00:00:00
(2/8): base3/filelists_db
                                    | 1.5 MB  00:00:00
(3/8): base3/primary_db
                                    | 2.3 MB  00:00:00
(4/8): base2/primary_db
                                    | 5.3 MB  00:00:01
(5/8): base3/prestodelta
                                     | 161 kB  00:00:00
(6/8): base2/filelists_db
                                    | 6.2 MB  00:00:01
(7/8): base2/other_db
                                    | 2.3 MB  00:00:03
(8/8): base3/other_db
                                    |  19 MB  00:00:02
(1/6): base0/filelists
                                     |  326 B  00:00:00
(2/6): base0/primary
                                     |  723 B  00:00:00
(3/6): base0/other
                                     |  309 B  00:00:00
(4/6): base1/filelists
                                     |  150 B  00:00:00
(5/6): base1/primary
                                     |  157 B  00:00:00
(6/6): base1/other
                                     |  145 B  00:00:00
base0
                                                       1/1
base0
                                                       1/1
base0
                                                       1/1
Metadata Cache Created
Cleaning repos: docker0
0 metadata files removed
0 sqlite files removed
0 metadata files removed
docker0
                                    | 3.4 kB  00:00:00
(1/4): docker0/filelists_db
                                    | 246 kB  00:00:00
(2/4): docker0/other_db
                                    | 256 kB  00:00:00
(3/4): docker0/primary_db
                                    |  90 kB  00:00:00
(4/4): docker0/prestodelta
                                     |  16 kB  00:00:01
Metadata Cache Created
Error: Failed to create ploop image
/var/tmp//vzpkg.vrDKJ9/cache-private/root.hdd/root.hds: Error in add_delta
(ploop.c:1345): Can't add image
/var/tmp//vzpkg.vrDKJ9/cache-private/root.hdd/root.hds: unsupported
underlying filesystem 3
Error: Cannot create ploop device
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