fixed maven compile error.

apm-collector/apm-collector-core/src/test/java/org/skywalking/apm/collector/core/module/ModuleAProvider.java

@@ -51,7 +51,6 @@ public class ModuleAProvider extends ModuleProvider {
     public class Business1 implements BaseModuleA.ServiceABusiness1 {
 
         @Override public void print() {
-            System.out.println("ModuleA.Business1.print()");
         }
     }
 

apm-collector/apm-collector-core/src/test/java/org/skywalking/apm/collector/core/module/ModuleBProvider.java

@@ -19,17 +19,6 @@
 package org.skywalking.apm.collector.core.module;
 
 import java.util.Properties;
-import net.bytebuddy.ByteBuddy;
-import net.bytebuddy.description.method.MethodDescription;
-import net.bytebuddy.implementation.MethodDelegation;
-import net.bytebuddy.matcher.ElementMatcher;
-import org.junit.Test;
-import org.skywalking.apm.collector.core.module.instrument.ServiceMetricCollector;
-import org.skywalking.apm.collector.core.module.instrument.TracedService;
-
-import static net.bytebuddy.matcher.ElementMatchers.isStatic;
-import static net.bytebuddy.matcher.ElementMatchers.named;
-import static net.bytebuddy.matcher.ElementMatchers.not;
 
 /**
  * @author wu-sheng