DeployMethod support & Flow Data API

[hanzac]

1. Add DeployMethod interface
   • Support three methods to deploy: 1 Default HDFS/2 SSH/3 FTP
2. Support get the flow design time data and the flow runtime data according to the flow's data definition
   • If the data is directory, it will return the directory list. Then get each data file in the directory by using http://HOST_NAME:PORT/dashview/USER_NAME/flow/dfs/DATA_FILE_PATH