LU-14045 sec: fix O_DIRECT and encrypted files

LU-14045 sec: fix O_DIRECT and encrypted files

Sometimes, we can end up in a situation where
osc_release_bounce_pages() mistakenly consider pages as fscrypt
bounce pages, and tries to free them.
Fix the way we consider bounce pages by always setting the PageChecked
flag on them.
Also remove sanity test_426 from the ALWAYS_EXCEPT list.

Test-Parameters: testlist=sanity-sec envdefinitions=ONLY="36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 52 53 54" clientdistro=ubuntu2004 fstype=ldiskfs mdscount=2 mdtcount=4
Test-Parameters: testlist=sanity-sec envdefinitions=ONLY="36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 52 53 54" clientdistro=ubuntu2004 fstype=zfs mdscount=2 mdtcount=4
Fixes: 728036f256 ("LU-12275 sec: O_DIRECT for encrypted file")
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Ic54ae031c3b0baa17ffed8a6b6b90ff44f87ff58
Reviewed-on: https://review.whamcloud.com/40295
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>