LU-13799 llite: Move free user pages

LU-13799 llite: Move free user pages

It is incorrect to release our reference on the user pages
before we're done with them - We need to keep it until the
i/o is complete, otherwise we access them after releasing
our reference.  This has not caused any known bugs so far,
but it's still wrong.

So only drop these references when we free the aio struct,
which is only freed once i/o is complete.

Also rename free_user_pages to release_user_pages, because
it does not free them - it just releases our reference.

This also helps performance by moving free_user_pages to
the daemon threads.  This is a 5-10% boost.

This patch reduces i/o time in ms/GiB by:
Write: 18 ms/GiB
Read: 19 ms/GiB

Totals:
Write: 180 ms/GiB
Read: 178 ms/GiB

mpirun -np 1  $IOR -w -r -t 64M -b 64G -o ./iorfile --posix.odirect

With previous patches in series:
write     5183 MiB/s
read      5201 MiB/s

Plus this patch:
write        5702 MiB/s
read         5756 MiB/s

Lustre-change: https://review.whamcloud.com/39443
Lustre-commit: 7f9b8465bc1125e51aa29cdc27db9a9d6fdc0b89

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: I5cf2201e5fd4eeee5b4c996de51d3a6a5394ae34
Reviewed-on: https://review.whamcloud.com/44685
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>