scripts/*: fix comments

This is a missing part from commit 0154b000e527d2608b6b3d8f7b5b441cc997c5db

It fixes comments in scripts:
* Better, more clear descriptions of scripts
* Remove references to non-existent man pages
* CT -> container in some cases
* Fixed VE_STATE description (can not be 'stopped')

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