Fix for ATEAM-341: Have ByteStreamEventStorageOutputSvc::io_reinit() reset...

Fix for ATEAM-341: Have ByteStreamEventStorageOutputSvc::io_reinit() reset m_dataWriter for AthenaMP (ByteStreamCnvSvc-01-34-41-02)

	* Tagging ByteStreamCnvSvc-01-34-41-02.
	* src/src/ByteStreamEventStorageOutputSvc.cxx: Have io_reinit() reset
	m_dataWriter for AthenaMP to work even if mother wrote events.

Event/ByteStreamCnvSvc/src/ByteStreamEventStorageOutputSvc.cxx

@@ -432,5 +432,7 @@ StatusCode ByteStreamEventStorageOutputSvc::io_reinit() {
       // FIXME: modify file name, not done for now because of IoUtils.update_io_registry vs. merge conflict.
       //m_simpleFileName.setValue(outputFile.substr(outputFile.find_last_of("/") + 1));
    }
+   ATH_MSG_DEBUG("Deleting DataWriter");
+   m_dataWriter.reset();
    return(this->reinit());
 }