Enhance the Gets in the connector

Current the Spark-Module Spark SQL implementation gets records from HBase from the driver if there is something like the following found in the SQL.

rowkey = 123

The reason for this original was normal sql will not have many equal operations in a single where clause.

Zhan, had brought up too points that have value.
1. The SQL may be generated and may have many many equal statements in it so moving the work to an executor protects the driver from load
2. In the correct implementation the drive is connecting to HBase and exceptions may cause trouble with the Spark application and not just with the a single task execution