vzctl: Initial yoda file

Only arguments. Options _heavily_ depend on arg command, so in
order to process them effectively need a "set for" command.

Signed-off-by: Pavel Emelyanov <xemul@sacred.ru>
yoda: Introduce set and unset commands

These can be used to set default values for what is normally
an option/arg descriptor. Currently work for "for" and "req_for".

Signed-off-by: Pavel Emelyanov <xemul@sacred.ru>
vzctl: Add 'create' options

Signed-off-by: Pavel Emelyanov <xemul@sacred.ru>