refactor trimmers to their own files

apps/i2psnark/java/src/net/i2p/kademlia/RejectTrimmer.java

@@ -0,0 +1,13 @@
+package net.i2p.kademlia;
+
+import net.i2p.data.SimpleDataStructure;
+
+/**
+ *  Removes nothing and always rejects the add. Flood resistant..
+ *  @since 0.9.2
+ */
+public class RejectTrimmer<T extends SimpleDataStructure> implements KBucketTrimmer<T> {
+    public boolean trim(KBucket<T> kbucket, T toAdd) {
+        return false;
+    }
+}