LU-9771 flr: FLR+PFL test cases

LU-9771 flr: FLR+PFL test cases

* add some PFLR test cases.
* improve some lfs getstripe output.

Test-Parameters: testlist=sanity-flr
Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Jian Yu <jian.yu@intel.com>
Change-Id: Id27ad50456f1c51287df61fc93a2b18a3c6a6361
Reviewed-on: https://review.whamcloud.com/29101
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>