Merge pull request #141 from mattyb149/pdi-9556

PDI-9556: Removed Cassandra steps from Big Data plugin
Updated to add Java 7 JDBC API method getParentLogger()
Merge pull request #142 from mattyb149/master

Updated to add Java 7 JDBC API method getParentLogger()
BAD-45: Updated JDBC test classes for Java 7 JDBC API
Merge pull request #143 from mattyb149/master

BAD-45: Updated JDBC test classes for Java 7 JDBC API
PDI-9556: Removed dependencies only used by Cassandra steps