EX-7601 osc: move common CSDC code to the library

EX-7601 osc: move common CSDC code to the library

CSDC repacks a chunk on the server side in case of the
partial rewrite. There are routines that can be shared
between client and server.

This patch moves common compression code to the
libcfs.

Signed-off-by: Artem Blagodarenko <ablagodarenko@ddn.com>
Change-Id: I824211a3435b0479f7a3b8f08598a5b567b67d3c
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52262
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>