smartd reopens SCSI devices as ATA devices after a SAT layer has been

detected. This upsets scsi generic nodes in linux. Detect this in
os_linux.cpp and adjust the open(2) function flags accodringly.


git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@2459 4ea69e1a-61f1-4043-bf83-b5c94c648137