DRILL-1414: Move profile storage to DFS rather than using PStore
DRILL-98: MongoDB storage plugin

This commit disables MongoDB PStore due to changes to the PStore interface.
DRILL-1425: Handle unknown operators in web ui
DRILL-1426: Add IO wait stats to HBaseRecordReader
DRILL-1398: Clone HivePartition only when InputSplit has non-null partition in InputSplit->Partition map.