Add support for multiple databases

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Database configuration (conf/database/dbConfig.properties for example) should 
go with /conf/feedserver/{namespace}/AdapterConfig so that multiple databases 
can be supported on the same server instance.  As of now, only one is 
supported and all AdapterConfigs share the same dbConfig.properties 
configuration.

Original issue reported on code.google.com by [e-mail] on 13 Jun 2009 at 9:57