Synchronize Scala reflection access in two more places.
Synchronize Scala reflection access in two more places.

Lack of TypeTag synchronization was causing random failures of
the integration test suite on Linux.

debasish83/cassandra-driver-spark,maasg/spark-cassandra-connector,shashwat7/spark-cassandra-connector,christobill/spark-cassandra-connector,maasg/spark-cassandra-connector,debasish83/cassandra-driver-spark,datastax/spark-cassandra-connector,christobill/spark-cassandra-connector,ponkin/spark-cassandra-connector,shashwat7/spark-cassandra-connector,jimenefe/spark-cassandra-connector,datastax/spark-cassandra-connector,ponkin/spark-cassandra-connector,jimenefe/spark-cassandra-connector