LU-17364 llite: don't use stale page.

LU-17364 llite: don't use stale page.

using stale page for write might confuse a read path,
which expect any IO page have PG_uptodate flag set,
and it caused an panic with removing from IO.

Test-Parameters: testlist=sanityn env=SLOW=yes,ONLY=16k,ONLY_REPEAT=10
Test-Parameters: testlist=sanityn env=SLOW=yes,ONLY=16k,ONLY_REPEAT=10
Test-Parameters: testlist=sanityn env=SLOW=yes,ONLY=16k,ONLY_REPEAT=10
Test-Parameters: testlist=sanityn env=SLOW=yes,ONLY=16k,ONLY_REPEAT=10
Test-Parameters: testlist=sanityn env=SLOW=yes,ONLY=16k,ONLY_REPEAT=10
Test-Parameters: testlist=sanityn env=SLOW=yes,ONLY=16k,ONLY_REPEAT=10
Signed-off-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Change-Id: Ia01129ceaecf53d8d9f301c26cd2d65122f6a267
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53550
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>