LU-3230 osp: bail out of precreate_reserve on I/O errors

LU-3230 osp: bail out of precreate_reserve on I/O errors

Allow osp_precreate_reserve to propogate error if
precreate_cleanup_ophans recives EIO.

Test-Parameters: testgroup=review-zfs
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ib6a109df82be610a21391777b9c293d78b2114e6
Reviewed-on: http://review.whamcloud.com/6988
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Li Wei <wei.g.li@intel.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>