drill

84645192 - MD-12: Filters are not being pushed down through maprdb plugin

MD-12: Filters are not being pushed down through maprdb plugin + Reverted mapr-hbase back to MapR 4.0.1 release + Apply DRILL-1508 and DRILL-1567 to MapRDB plugin 1. https://github.com/apache/drill/commit/67df8cfa27041c9696255ee96e2d066e034f6f58 2. https://github.com/apache/drill/commit/71f5ad447823cba96cf73fb6709f8ed6cc0b63e9