revert logger file appender

Author: rashtao

src/test/resources/logback-test.xml

@@ -4,11 +4,24 @@
     <!-- encoders are assigned the type
          ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
     <encoder>
-      <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+      <pattern>%d{HH:mm:ss.SSS} %-5level %logger{36} - %msg%n</pattern>
     </encoder>
   </appender>
 
-  <root level="info">
+  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
+    <file>tikerpopTests.log</file>
+    <append>false</append>
+    <!-- set immediateFlush to false for much higher logging throughput -->
+    <immediateFlush>true</immediateFlush>
+    <!-- encoders are assigned the type
+         ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
+    <encoder>
+      <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
+    </encoder>
+  </appender>
+
+  <root level="INFO">
+    <appender-ref ref="FILE" />
     <appender-ref ref="STDOUT"/>
   </root>