Show jobs may get results in random order

[tobegit3hub]

Now we execute the command show jobs will get jobs in random order. Here is the code of implementation.

Since order by is not supported in online mode, we may support this later.

127.0.0.1:7527/__INTERNAL_DB> SELECT * FROM JOB_INFO ORDER BY id;
W0505 14:56:06.837318 329897472 tablet_client.cc:95] fail to query tablet
Error: Non-support kSortPlan Op in cluster online training