Cache Results in org.apache.hadoop.hbase.rest.client.RemoteHTable.Scanner

The implementation of org.apache.hadoop.hbase.rest.client.RemoteHTable.Scanner
is very inefficient, as the standard next() methods makes separate a http request for each row.

Performance can be improved by not specifying the row count in the REST call and caching the returned Results.

Chunk size can still be influenced by scan.setBatch();