LU-15670 clio: Disable lockless for DIO with O_APPEND

LU-15670 clio: Disable lockless for DIO with O_APPEND

Lockless O_DIRECT with O_APPEND can allow interleaved / racy
appends from concurrent I/O.

Disable lockless I/O when O_APPEND is set

Lustre-change: https://review.whamcloud.com/46890
Lustre-commit: 649d638467c0375797cd59ab7c9ac4113e6c682e

HPE-bug-id: LUS-9776
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I5c56f92c90e631c295f56e5958985f516e1990f8
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/49666
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>