fixed the client unittests for search run_num. The unittests failed offten when test on cmsweb-testbed due to running off the time. This was caused by using run_num=1 that is all the MC data has. We should never search on run_num=1. In additon, the unittests had both parent and child have the same lfns. This was fixed too.
Merge pull request #371 from yuyiguo/fix-unittests

fixed the client unittests for search run_num. The unittests failed offt...