Fix a few user-visible messages to be more clear.

Another forgotten piece of commit 0154b000e527d2608b6b3d8f7b5b441cc997c5db

This one:
* add word VE_ROOT in addition to "Container root" which is now not that clear
* cpu[s] -> CPU[s] in a few messages and comments
* 2level quota -> second-level quota in a few messages and comments

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
3 files changed