EX-6245 csdc: define compress component layout

EX-6245 csdc: define compress component layout

Define a layout containing compress component with a compress
pattern so that old client cannot process it.

Add a client parameter to enable file compression support.

lctl get_param llite.*.enable_compression
lctl set_param llite.*.enable_compression={0,1}

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: If88d446fc7425644ea9484004ffa4e6d2a05f7e6
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/49508
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>