vzctl create: show tarball extraction progress using pv

If pv tool is available, make use of it to show a nice progress bar,
like this:

Creating container private area (fedora-15-x86)
44.5MB 0:00:09 [4.96MB/s] [======>                            ] 21% ETA 0:00:32

Isn't it cute? ;)

While at it, simplify error message (and get rid of 'error' because it
is already printed by vzerror).

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
1 file changed