Check_MK: customized Windows event log

REF: http://lists.mathias-kettner.de/pipermail/checkmk-en/2013-July/009851.html

>>> If you create a file called check_mk.ini in the agent directory then
>>> you can configure which eventlogs and which levels to process. Here is an
>>> example:
>>> check_mk.ini
>>>
>>>
>>>
>>> [logwatch]
>>>     # From the Application log send only critical messages
>>>     *logfile application = crit*
>>>
>>>     # From the Security log send all messages
>>>     *logfile security = all*
>>>
>>>     # Do not process other event logs at all
>>>     *logfile * = off*
>>>