[ci] Move velocity log into target directory

Author: hazendaz

src/test/java/org/apache/ibatis/submitted/language/VelocitySqlSource.java

@@ -1,5 +1,5 @@
 /**
- *    Copyright 2009-2015 the original author or authors.
+ *    Copyright 2009-2016 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -42,6 +42,7 @@ public class VelocitySqlSource implements SqlSource {
   private final Template script;
 
   static {
+    Velocity.setProperty("runtime.log", "target/velocity.log");
     Velocity.init();
   }