LU-12885 llite: mark extended attr and inode flags

LU-12885 llite: mark extended attr and inode flags

Clearly name the extended attribute and inode flags so that it is
possible to distinguish them more easily.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Id1ad2ba6411f69efb2de38e1019940f5fb3ebbe5
Reviewed-on: https://review.whamcloud.com/36519
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Oleg Drokin <green@whamcloud.com>