OAK-1510 MongoDB / DocumentNodeStore DataStore GC performance (patch 2)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1579175 13f79535-47bb-0310-9956-ffa450edef68
OAK-1569: ClusterPermissionsTest occasionally fails on Windows
Disable test for now

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1579178 13f79535-47bb-0310-9956-ffa450edef68
OAK-333 1000 byte path limit in MongoMK

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1579182 13f79535-47bb-0310-9956-ffa450edef68