LU-16085 llite: fix stat attributes_mask

LU-16085 llite: fix stat attributes_mask

Fix stat attributes_mask to return STATX_ATTR_ENCRYPTED whenever it is
possible. Also fix sanityn test_106c to expect at least the 0x30 flag
for attributes_mask.

Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Icd16beff058c42d77e9b04ad1a287ec2ac04dfed
Reviewed-on: https://review.whamcloud.com/48208
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>