MB-24992: Turn on Leveled compactions
MB-24992: Turn on Leveled compactions

Current configurations
CompactionPercentage : 0.6
CompactionLevelMaxSegments : 4
CompactionLevelMultiplier : 9

Change-Id: Ib8393da75bbb53f4f030cccfa36ddc81722d092d
Reviewed-on: http://review.couchbase.org/79917
Well-Formed: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Sundararaman Sridharan <333a3f71d3ad6e01fc953c4fa06bc1f3cd014910@couchbase.com>
Reviewed-by: Marty Schoch <ba9951d7d66412e2a57aea395f01176a793cf5eb@gmail.com>

steveyen/moss,steveyen/moss,couchbaselabs/moss