rename head check file name

apm-collector/apm-collector-agentstream/src/test/java/org/skywalking/apm/collector/agentstream/TestCheckStyle.java

+package org.skywalking.apm.collector.agentstream;
+
+/**
+ * @author pengys5
+ */
+public class TestCheckStyle {
+}

checkStyle.xml

@@ -30,7 +30,7 @@
 
     <!-- header -->
     <module name="Header">
-        <property name="headerFile" value="CHECKSTYLE_HEAD"/>
+        <property name="headerFile" value="java.header"/>
     </module>
 
     <module name="RegexpSingleline">