LU-4423 lov: use correct env in lov_io_data_version_end()

LU-4423 lov: use correct env in lov_io_data_version_end()

lov - the logical object volume manager - is responsible for
striping data across multiple volumes.

So when it is given a request, it creates one or more
sub-requests, one for each target volume.  Each sub_io
request has a sub_env environment which it operates in.

When lov_io_data_version_end() calls lov_io_end_wrapper() to
wait for and close off a sub_io, it passes the wrong
environment.

This causes an LINVRNT() to fail in cl2osc_io(), and may
cause other problems.

This patch changes the call to use ->sub_env, much like
other code in the same file.

Change-Id: Id120929f4189196232d18103007e45ba89195fff
Fixes: fcd45488711a (LU-5683 clio: add CIT_DATA_VERSION)
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/31418
Reviewed-by: Jinshan Xiong <jinshan.xiong@gmail.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>