HAWQ-489. Fix missing errno for libhdfs function call.
HAWQ-489. Fix missing errno for libhdfs function call.

jianlirong/incubator-hawq,outofmem0ry/incubator-hawq,wengyanqing/incubator-hawq,stanlyxiang/incubator-hawq,outofmem0ry/incubator-hawq,wengyanqing/incubator-hawq,outofmem0ry/incubator-hawq,jianlirong/incubator-hawq,huor/incubator-hawq,jianlirong/incubator-hawq,stanlyxiang/incubator-hawq,wengyanqing/incubator-hawq,stanlyxiang/incubator-hawq,lavjain/incubator-hawq,huor/incubator-hawq,outofmem0ry/incubator-hawq,jianlirong/incubator-hawq,lavjain/incubator-hawq,huor/incubator-hawq,huor/incubator-hawq,lavjain/incubator-hawq,jianlirong/incubator-hawq,outofmem0ry/incubator-hawq,huor/incubator-hawq,outofmem0ry/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,huor/incubator-hawq,stanlyxiang/incubator-hawq,stanlyxiang/incubator-hawq,huor/incubator-hawq,lavjain/incubator-hawq,wengyanqing/incubator-hawq,stanlyxiang/incubator-hawq,lavjain/incubator-hawq,outofmem0ry/incubator-hawq,wengyanqing/incubator-hawq,wengyanqing/incubator-hawq,lavjain/incubator-hawq,lavjain/incubator-hawq,jianlirong/incubator-hawq,wengyanqing/incubator-hawq,outofmem0ry/incubator-hawq,wengyanqing/incubator-hawq,lavjain/incubator-hawq,stanlyxiang/incubator-hawq