[Pdi 11344] - Fix test's failing

Test is put to the incorrect module. This causes fails on the CI. See: http://ci.pentaho.com/view/Data%20Integration/job/Kettle-integration-tests/454/consoleFull for example

compile-integration-tests:
     [echo] Compiling Kettle tests...
    [javac] Compiling 163 source files to /build/hudson/jobs/Kettle-integration-tests/workspace/testClasses
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6
    [javac] /build/hudson/jobs/Kettle-integration-tests/workspace/test/org/pentaho/di/trans/steps/blockingstep/BlockingStepTest.java:53: error: package org.pentaho.di.trans.steps.mock does not exist
    [javac] import org.pentaho.di.trans.steps.mock.StepMockHelper;
    [javac]                                       ^
    [javac] /build/hudson/jobs/Kettle-integration-tests/workspace/test/org/pentaho/di/trans/steps/blockingstep/BlockingStepTest.java:365: error: cannot find symbol
    [javac]     StepMockHelper<BlockingStepMeta, BlockingStepData> mockHelper =
    [javac]     ^
    [javac]   symbol:   class StepMockHelper
    [javac]   location: class BlockingStepTest
    [javac] /build/hudson/jobs/Kettle-integration-tests/workspace/test/org/pentaho/di/trans/steps/blockingstep/BlockingStepTest.java:366: error: cannot find symbol
    [javac]       new StepMockHelper<BlockingStepMeta, BlockingStepData>( "BlockingStep", BlockingStepMeta.class,
    [javac]           ^
    [javac]   symbol:   class StepMockHelper
    [javac]   location: class BlockingStepTest
    [javac] 3 errors
    [javac] 1 warning