Operate: better support of HDFS file list handling. Closes #2271.
Operate: better support of HDFS file list handling. Closes #2271.

1. Remove useless file list variable HDFS_FILE
2. Revamp file list method
3. File list items is fetched runtime
4. Redesign refresh timimg, e.g., on login, on reset
5. Redesign properties handling logic

moneycat/CloudDOE,moneycat/CloudDOE,moneycat/CloudDOE