vzubc: lower chances to lose data

Option -rc can be dangerous if used together with -rd (think of
"vzubc -rd $HOME -rc")!

Do not try to delete the files recursively and add the "ubc." prefix to
the files we create to lower the chances of removing something we didn't
create.

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