LU-9733 obd: fix fsname parsing

LU-9733 obd: fix fsname parsing

Lustre support Lustre fsname started with numbers.
So here we should try fsname firstly, if it failed,
fall back to number parsing.

Lustre-change: https://review.whamcloud.com/27916
Lustre-commit: cae71501680330a38c9bb16c25bf9c85dc0ec4e0

Change-Id: Idd98b9fdc8375729faa61f51251caa101035dd93
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Gu Zheng <gzheng@ddn.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/28814
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>