send the current user rather than rishu

With this fix i got 9/10 passing

 T E S T S
-------------------------------------------------------
Running org.apache.falcon.regression.ProcessInstanceResumeTest
Tests run: 10, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 369.12 sec <<< FAILURE!
testProcessInstanceResume_onlyEnd(org.apache.falcon.regression.ProcessInstanceResumeTest)  Time elapsed: 38.926 sec  <<< FAILURE!
java.lang.NullPointerException: null
        at org.apache.falcon.regression.ProcessInstanceResumeTest.testProcessInstanceResume_onlyEnd(ProcessInstanceResumeTest.java:137)


Results :

Failed tests:
  ProcessInstanceResumeTest.testProcessInstanceResume_onlyEnd:137 NullPointer