man/vz.conf.5: better explain LOG_LEVEL and VERBOSE

1. Make sure reader gets that LOG_LEVEL is only for log file,
   while VERBOSE is for console.

2. Add default value for LOG_LEVEL.

3. Describe what happens if LOG_LEVEL=-1.

4. Emphasize VERBOSE description.

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