bash_completion: vzlist's stderr goes to /dev/null

vzlist can write some warnings to stderr. This is not
what we want to see while working with bash_completion.

Example of what could happen before applying this patch:
 vzctl create <tab>Invalid value for IOPRIO=88, skipped

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