Issues with staging dirs with materialized views on HDFS encrypted table

In the materialized view registry thread which runs in the background, there are 2 issues involving staging directories on hdfs encrypted tables

1) The staging directory is created at compile time.  For non hdfs encrypted tables, the "mkdir" flag is set to false.  There is no such flag for hdfs encrypted tables.

2) The "FileSystem.deleteOnFileExit()" method is not called from the HiveMaterializedViewRegistry thread.