Fix typo

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Fix logic and defaults for syslog_log_level.

By default, openstack uses WARNING level if non debug
and non verbose, thus this default level is now configurable
with syslog_log_level (default is WARNING as well)

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>