LU-3289 osp: osp_precreate_thread does not check for errors

LU-3289 osp: osp_precreate_thread does not check for errors

If servers do not have a valid key for GSS the call to
osp_statfs_update() can fail.  This patch breaks the loop in the
event of a failure from osp_statfs_update().

Signed-off-by: Jeremy Filizetti <jeremy.filizetti@gmail.com>
Change-Id: I576cff86d285c4263e8d98cccb9b3c6943af6f75
Reviewed-on: http://review.whamcloud.com/17598
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>