HAWQ-1195. Fixed error "Two or more external tables use the same error table "
HAWQ-1195. Fixed error "Two or more external tables use the same error table "

The error table should be works same as normal user table on hdfs, which support multiple INSERTs.

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