1. Fixed a drill connection bug that caused re-use of connections.
2. Implemented uploading of dfs schema json file to storage plugin server.
 - A dfs storage plugin template file is added and being referenced in the framework to facilitate runtime uploading of the file.
 - It is imperative that creator of a new test suite that uses a new schema add an entry in the template file (and not touch any other parts of the file).
 - In addition, the drill test framework file must be configured to assign a correct value to the property DRILL_STORAGE_PLUGIN_SERVER.  This is exclusively for dfs schemas.