Examples and Tests for Sqoop Execution

1) Included examples for both Sqoop Export and Import with Execution
2) Added tests for the examples
3) Added tests for the SqoopExecution trait especially for the failure scenarios
@SamRoberts Yes, no low-level sql string manipulation in Maestro.
@stephanh currently ParlourDsl always starts with new SqoopOptions, there is no way to pass SqoopOptions created elsewhere. We could quite easily allow to do that, but then ParlourDsl would be mutable. Did I understand you correctly?