OAK-1667 Encode Blob length as part of blobId in DataStoreBlobStore
 - merged to 1.0 branch



git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1588023 13f79535-47bb-0310-9956-ffa450edef68
OAK-1726 Improve support for local caching in DataStoreBlobStore
 - merged to 1.0 branch




git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1588025 13f79535-47bb-0310-9956-ffa450edef68