LU-11393 osd-zfs: time struct changes

LU-11393 osd-zfs: time struct changes

Account for changes in 0.7.10 and pre 0.8 changes in ZFS that change
the time structure.

Test-Parameters: trivial
Signed-off-by: Nathaniel Clark <nclark@whamcloud.com>
Change-Id: I5c2373d053ea92d8bf04befe1d096159b8a34126
Reviewed-on: https://review.whamcloud.com/33345
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>