blinkdb convert all command line to lowercase

[zhangxuhong]

Blinkdb will fail if using SERDE, for example

ROW FORMAT SERDE 'org.openx.data.jsonserde.JsonSerDe'

JsonSerDe class will not be found, because blinkdb will convert the command to

ROW FORMAT SERDE 'org.openx.data.jsonserde.jsonserde'

Suggest to modify SharkDriver.scala line 175.