vzctl set --devnodes: made cumulative, fix

This patch fixes the handling of --devnodes option.

First, the option is now cumulative, so any new devices set by
"vzctl set --devnodes" command are added to the existing devices.

Second, "vzctl set --devnodes DEV:none --save" removes DEV from the
configuration.

https://bugzilla.openvz.org/3186

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