[MINOR] Parfor remove set opt level

This commit remove the forced logging level when using parfor.
To enable the logging please use the log4j properties file.

Author: Baunsgaard

src/main/java/org/apache/sysds/runtime/controlprogram/ParForProgramBlock.java

@@ -599,7 +599,6 @@ public void execute(ExecutionContext ec)
 		//OPTIMIZATION of ParFOR body (incl all child parfor PBs)
 		///////
 		if( _optMode != POptMode.NONE ) {
-			OptimizationWrapper.setLogLevel(_optLogLevel); //set optimizer log level
 			OptimizationWrapper.optimize(_optMode, sb, this, ec, _numRuns); //core optimize
 		}
 

src/main/java/org/apache/sysds/runtime/controlprogram/parfor/opt/OptimizationWrapper.java

@@ -24,8 +24,6 @@
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.log4j.Level;
-import org.apache.log4j.Logger;
 import org.apache.sysds.api.DMLScript;
 import org.apache.sysds.conf.ConfigurationManager;
 import org.apache.sysds.hops.OptimizerUtils;
@@ -109,11 +107,6 @@ public static void optimize( POptMode type, ParForStatementBlock sb, ParForProgr
 		}
 	}
 
-	public static void setLogLevel( Level optLogLevel ) {
-		Logger.getLogger("org.apache.sysds.runtime.controlprogram.parfor.opt")
-			.setLevel( optLogLevel );
-	}
-
 	private static void optimize( POptMode otype, int ck, double cm,
 		ParForStatementBlock sb, ParForProgramBlock pb, ExecutionContext ec, int numRuns ) 
 	{