* 1, enhance xcatperftest to support run testing on different number of nodes without changing DB
2, give a default DB command lists
* 1, Using environment to customize TIMEOUT
2, Refine the screen output to ignore the node name lists
3, For run in existing cluster, finally run a full node range test.
- refine the xcatperftest tool to make it be easily integrated into xcattest
- add testcase/performance/.. to trigger the performance testcase
- fix manpage missing issue for xcatperftest