Changes to support hive insert statement for cassandra.

The changes included supports following hive insert statement

create external table keyspace.tableName(col1 type, col2 type) STORED by 'org.apache.hadoop.hive.cassandra.cql.CqlStorageHandler'

where tableName is created in keyspace using cqlsh statement

create table tweets (tweet_id text primary key, author text, body text) with compact storage;