CDAP should warn users when a partitioning column has the same name as a table column

When leveraging dynamic partitioning, if you specify a partitioning column that is the same name as a column in the record, writing the data is fine, but hive will fail with the following error. The behavior is explained here: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-PartitionedTables

We should warn the user about it somehow.