It's may be useful for Jenkins or other auto executors, but human would
prefer to open log file in text editor rather than scroll a terminal
history.

The error message in non-verbose mode contains only critical information
such as error messages and paths to log files.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>