Mixed dedup and compression

Mixed dedup and compression

Introducing support for dedupe and compression
on the same job. When used together, compression is
calculated from unique capacity. E.g. when using
dedupe_percentage=50 and buffer_compress_percentage=50,
then total reduction should be 75% - 50% would be deduped
while 50% of the remaining buffers would be compressed

Signed-off-by: Bar David <bardavvid@gmail.com>