OAK-2057 Add timing to OrderedIndex

Merging r1627503 into 1.0 branch resolving a tree conflict for
oak-core/src/main/java/org/apache/jackrabbit/oak/stats/StopwatchLogger.java 




git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1627511 13f79535-47bb-0310-9956-ffa450edef68