vzctl create: warn if default sample is not to be used

In case CT config already exists, a default configuration sample (the one
specified as CONFIGFILE in vz.conf) is not being used. This is aimed at
advanced user who knows what to do.

Still, some people mistakenly set a few CT parameters before vzctl create,
and it ends up with incomplete config (and inability to start).

For those, emit the following helpful warning:

 Warning: CT config file already exists, not applying a default config sample.
 It might lead to incomplete CT configuration, you can use --applyconfig to fix.

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