LU-4944 osd: support for zfs-0.6.3

dsl_sync_task_nowait() replaces dsl_sync_task_do_nowait() and we have
to support the both versions: 0.6.2 and 0.6.3

Change-Id: I4e2e91eae40358e2cd68ab26107e51037c8fb09c
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: http://review.whamcloud.com/10064
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
LU-4423 gss: fix checkpatch warning

sizeof *null_context_new is a bad coding style.

Change-Id: Ie71803940347bd4b92d502a547d046a065bb4387
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/10118
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
LU-4423 style: Change comment to fit within 80 columns

A statahead commend had too long lines. This needed to be
fixed in order to get the patch upstream

Change-Id: I4a899a36d83591195727847712232dfca26f2d35
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/10121
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>