IBM / ubiquity / 1440

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Fix/ub-600 : sg_inq is skipped if device is faulty (#250)

in case a device is faulty we identify the situation and skip sg_inq + sontinue to to do the rest of the umount flow as needed.
this is done to prevent a situation where if a device has been faulty for a while and we try to umount it (~6 minutes) the sg_inq command usually gets stuck.
this should work for both ubuntu + red hat (the multipath output is a bit differente between them)

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