NEX-1943 Backport OS-253 We should not free mdi_pathinfo in mptsas when devices is retired
NEX-1939 Backport NEX-1438 Dell faulting drives for slow IO
NEX-1894 Backport NEX-1857 add the pkt_reason field to the slow-io error detector
NEX-1938 Backport NEX-1923 Retiring a device may hang or leave device unusable after unretire
NEX-1938 Backport NEX-1923 Retiring a device may hang or leave device unusable after unretire (fix cstyle)