STORM-914: AutoHDFS should also update hdfs.config into Configuration

[tedxia]

PR for STORM-914

When storm user use a specify hdfs cluster, he will put some config such as namenode.host into hdfs.config when submit storm topology, and when HdfsBolt create HdfsConfiguration, it will use hdfs.config update HDFSConfiguration, then HDFSBolt will visit the right hdfs cluster. But in AutoHDFS's renew and getHadoopCredentials, Configuration not for the HDFS that storm user specify, we should update all the Configuration with hdfs.config.

[tedxia]

@revans2 Will you take a look at this, thanks a lot.

[d2r]

@tedxia This PR is rather stale. Is it still being worked or should we close it?