MB-15417 Fix fragmentation calculation to use diskSz-dataSz/diskSz * 100
MB-15417 Fix fragmentation calculation to use diskSz-dataSz/diskSz * 100

Change-Id: I61f61d641bf24cc8af52af429d88ccbe72edc84a

jchris/indexing,jchris/indexing,jchris/indexing,jchris/indexing