OAK-2359 - diffImpl is inefficient when there are many split documents

Adding extra logging as per patch by Stefan

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1645948 13f79535-47bb-0310-9956-ffa450edef68
OAK-2192 Concurrent commit during compaction results in mixed segments
 - added #close call as test was failing in Win, more debug logs

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1645966 13f79535-47bb-0310-9956-ffa450edef68
OAK-2192 Concurrent commit during compaction results in mixed segments
Make 10h the default segment life time

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1645970 13f79535-47bb-0310-9956-ffa450edef68
OAK-2192 Concurrent commit during compaction results in mixed segments
 - wrapped the delete dir in a try/catch, as it sometimes fails on Win 

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1645971 13f79535-47bb-0310-9956-ffa450edef68