FELIX-3774, FELIX-3775 & FELIX-3776: - wrong key used in the retrieval of password property; - possible NPE when supplying the configuration for the first time (oldMongoDb can be null); - use sensible defaults and shorter keys for the configuration of the MongoDb backend.
felix/trunk/useradmin/mongodb/src/main/java/org/apache/felix/useradmin/mongodb/MongoDBStore.java