os_linux.cpp - hiding more debug messages from megaraid code, add correct...

os_linux.cpp - hiding more debug messages from megaraid code, add correct comments for the smart response emulation

git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@2957 4ea69e1a-61f1-4043-bf83-b5c94c648137