[SparkSQL][SPARK-4528] add comment support for Spark SQL CLI  spark-sql

while using *spark-sql*, found it does not support comment while write sqls. 
**Comment support** is widely using in many projects, it is a necessary to add this feature.
this implitation can be archived in  the source org.apache.spark.sql.hive.thriftserver.SparkSQLCLIDriver.scala.
##### three comment styles supported:
1. From a '#' character to the end of the line.
2. From a '--' sequence to the end of the line
3. From a /* sequence to the following */ sequence, as in the C programming language.
   This syntax allows a comment to extend over multiple lines because the beginning and closing sequences need not be on the same line.