[SQOOP-1873] Fix Mapreduce tests to use mocks/ test class for IDF that extends from the IDF base class - ASF JIRA

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Map reduce tests in the mapreduce package should mock/ use a test class the IDF and not rely on a concrete CSVIDF directly.

Also it should add tests for from and to IDF been different

Basic 101 of unit testing is to use mocks for unrelated objects

public class MRJobTestUtil
public class TestMapReduce
public class TestSqoopOutputFormatLoadExecutor

is a clone of

SQOOP-1872 IDF API should expose a method to add dependent jars

is cloned by

SQOOP-1997 Add more Mapreduce tests with different IDFs