Werk #8065: Savely direct any verbose or diagnostic output from check_mk or checks to cmc.log

If any check outputs something to stdout or stderr (which it should not do in production mode) or if a function in the check_mk code (such as inline SNMP) outputs data to stdout or stderr, then this will now savely be logged to the CMC log with the classification "warning". This will allow easier debugging and error handling. Also the logfile cmc-helper.log will no longer be created. Messages go into cmc.log instead.

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