OAK-2289: Async indexer checkpoints not cleaned up under heavy load
- merged r1641541

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1641542 13f79535-47bb-0310-9956-ffa450edef68
OAK-2293: Add checkpoint management for MongoMK

Merged 1641662 from trunk

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OAK-2293: Add checkpoint management for MongoMK

Merged 1641671 from trunk

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OAK-2288: DocumentNS may expose branch commit on earlier revision

Merged revision 1641695 from trunk

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OAK-2297: Update for absent document may throw NPE

Merged revision 1641811 from trunk

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